Malicious PDF — malware analysis report

Static analysis result for SHA-256 de4824ec1b297eaa…

MALICIOUS

PDF

98.8 KB Created: 2021-07-29 09:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8e5188d6baddce4b64f6fc7e2b86643 SHA-1: a6c1b07e0404f7654c8ead3b5d25c2f02c9c2fbd SHA-256: de4824ec1b297eaa1392254b8530da9371f055317f0a2c21b6c794537c1e0793
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a link farm pointing to various domains, suggesting an attempt to redirect users to malicious content. The presence of a 'Callback phishing phone lure' heuristic further indicates a social engineering attempt. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://itkaufmann.com/images/fckimages/file/tofar.pdf In PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/8368a0619636755c20668c91d05ca6bb/voxitetonin.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210722_181CDD406A017E75.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/wijep.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210528150513.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/tovozo.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/36535369051.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16097c15d0cf29---mupige.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10c0ab59a5---19561831594.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/17781876196.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/dofiwuxifurot.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/0r1dmmgsiqg38pfmn62663m8nk/nupopaseziponubavinifusew.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/muzovuzazefijoba.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/zelubugox.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/81633778493.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/24533758858.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/50619079198.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/lme45pldkndiht40jnqu8lgc4c/wefajuxinenerawifivux.pdfIn PDF document text
    • https://ntc-container.com/upload/files/javorovesuboko.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/daaaf043c619c80701a0ca85f7b702b3/sekawokuwojavub.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/doposekewe.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/7894b804c253b358bab5e48d6703a930/55034454880.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/figojopamibaparijomos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+get+money+using+western+unionPDF 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_off00011d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D11 17408 bytes
SHA-256: 836d9b26eb8428af48d415354ce0779d611a9f15b7cd06aa71476bdb8f752994
font_01_sfnt_off00014a8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A8B 10532 bytes
SHA-256: 0c7fd66eeee3afd2ca59cbc4105b1b3f62cd8c300097a2ab40b35fea2a47f197
font_02_sfnt_off00016293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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