Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6fc8b5a4ec181a7…

MALICIOUS

PDF

96.1 KB Created: 2021-07-19 19:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: af04f808a076a17c40507b43b3ed6c66 SHA-1: d4cc82f8b4a08a855f584aca344c00e30ce896c7 SHA-256: e6fc8b5a4ec181a7c2cdf82c0521cbbaa9a97a2137411289f7aab84c2c776840
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ML classifiers and ClamAV, and exhibits characteristics of a callback phishing lure. It contains numerous links to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to trick users into interacting with external resources, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://doellefjelde-mussemarked.dk/images/newsmail/file/fajarekogirujikumuradit.pdf In PDF document text
    • https://dienlanhbachkhoa.info/upload/files/kizuxunu.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070acdc4a021---jaxapagalolinawemos.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/50sniuqqmemd47dodlftg3vsm7/30381311360.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/vubegirepavagenupow.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160daf2eb09191---56029801627.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/sanixamenibajami.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/lugenip.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608180ef6994b---vifopu.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/jopeloliwusujimilute.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/11665030650.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c20696fb5---48546336103.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/jogawibud.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c53727395c---36153624577.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/rukuxosajakapoxuwurusexok.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/f2623efe709726dca1b88aee4b0c6cf0/lilosixomumisureterizesef.pdfIn PDF document text
    • http://adlinefor.com/home/webagen/public_html/korn/data/file/wipilifiz.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/6557617033.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/19b88e993c107cf054e436fcb1a01bcb/94374087262.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/j5p5s3k69fmafc86sk2cc80uoc/32443932045.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/791fbbd417decf94f68cb745be04d6e9/wopoxonekafisokonasol.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/f9f6cb140498e8564b6338e6e958d47d/91219485169.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/e301bfcsh2r36f24h833ih2o78/bafaboguliragedamagamenar.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/ev4ml23dkrcepgbkn2stjr2dn4/sikugivigarumufe.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/44139633447.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5a341d3bd---lawarutugevuxoxaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=vector+mechanics+for+engineers+statics+and+dynamics+solutionsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 11108 bytes
SHA-256: 76d07cfc818356b1cf6ac62abb39e1b9a64efea6420c7091a25a65dc05c978b7
font_01_sfnt_off0001203f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13851 18616 bytes
SHA-256: 8d3664b492f4f8606446a3e42124552412f78effa5e1730585f0f11585067272
font_03_sfnt_off00016998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16998 1516 bytes
SHA-256: 428222f383c78cccba6ad0234fb6f111a473c5f20e7b09f57027edddf25a256c

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