Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5b2424781f244c…

MALICIOUS

PDF

88.7 KB Created: 2021-07-03 10:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1c4d87bedf7661c4d17611cd1beb6c76 SHA-1: 8ecd6eec51afaf72b6515317440bcaa79394e4ed SHA-256: de5b2424781f244cfc1dcb80ef4fd958186876baaae97ddfc2179359e57eeeb0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous links to PDFs on various domains strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/vjlnh48tedp71q97vogoph55mt/leluviwabolepu.pdf In PDF document text
    • http://juha.be/_files/file/67890893689.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/83721680901.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba9e69db97---54130803557.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/jb9pnd45qsgcqht3grlef78rp6/54084195330.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/4428881751.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/18048982391.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16072a6e0b082a---ruromeguvevisefoxeg.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a19e9e4818dfa30dcb3229c5a8aa4c44/46654610969.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/gakitazemapiwiraga.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5456cb21e365a74eb5e651e0c4a915fd/dobatevepugulubuz.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/c7k8784uk349cndoh4bhapl6al/wobewatiweved.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/553148e626d3c78d99bab7f04269b7e1/pejunuwelomupiluzekelefe.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609dd90e885cb---nofolerol.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c02759bfe1---wigejurukumola.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6622ccc8d---dekusumovemuvosididujagax.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608300c685dcc---xirutaditedutiz.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160839568788c4---xenixavenikipamu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608657df745c9---83987041352.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/76997917088.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9b54a7cd9---82530052187.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/37948315210.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b974a5531c9---sirofudunumoledeludufaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=frostbite+on+your+feetPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB38 16700 bytes
SHA-256: 7c38a7bd0ff4214e044d2359bbe3cdefeced0826fd4b3a01f951c4ea7bf28c41
font_01_sfnt_off00012637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4E 10332 bytes
SHA-256: b814fd12f3f737d6fcf8b4ccceae92554b43e875b163b76de33b1b0bac1ea640

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