Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a9702cc547bf9f…

MALICIOUS

PDF

68.5 KB Created: 2021-09-26 16:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 43838d76d933caca8d78bcc0dc21b2b4 SHA-1: b9f4472f14cee35da8504134f11f4a29f10833a4 SHA-256: c4a9702cc547bf9f80a72b59d331ed14fcae98bbf58f6ca5b09a289a57941493
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which host other PDF files, indicating a link farm or redirection mechanism. The presence of a 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristic, along with a high ML score and ClamAV detection, strongly suggests malicious intent. The document body is heavily obfuscated, but the overall structure points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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://geombiagioschettino.eu/userfiles/files/59886253680.pdf In PDF document text
    • http://montazerangroup.com/uploader/file/64234725515.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/vijemagujatediluneliluv.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/72050553713.pdfIn PDF document text
    • https://expomediainc.com/upload/file/bugovulekulokefakupo.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4ec8ddf7c---pufepewemirolajupeka.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/8978985625.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/54294842924.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a2416274a---vowomugom.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/1782672212.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/kubazamovidurapidofe.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/tadafuwanepizapolagem.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/39245369425.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347f9b9ed9b---87726261554.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47776200760.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/wapidovikepuwokuxitunag.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/10619400897.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/40934133852.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/28191846430.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161464988e1966---39428161945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+studio+install+appPDF 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_off0000af83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF83 15092 bytes
SHA-256: 808dcd832f9059ce34bb640eb9829e232e929220c8ef43b4234220c053c7f347
font_01_sfnt_off0000d514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD514 10336 bytes
SHA-256: 9cc33753bb21de765755d13ae472e61ac2a19d420f2a7a4633e938fff691acf1
font_02_sfnt_off0000ec83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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