Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f726ef4dcfa9280…

MALICIOUS

PDF

77.6 KB Created: 2021-09-10 01:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1426c191c31350cb4165957bc914133c SHA-1: 014d433f70ade4abd6c5437f5ea61686bd9246c0 SHA-256: 7f726ef4dcfa9280d68eeef9130ab0311f8f8ad03706ae3d84b8b5fcd20e18ac
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, characteristic of a link farm used to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://posicert.com/upload_fck/file/2021-9-8/20210908072141684753.pdf In PDF document text
    • http://jan-fotografie.nl/upload/files/rinoxizusotojewowaf.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/48708610951.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210902142119.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ce29aa6d2---45062147520.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137b7453eb66---kufikimu.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/gobakeminewijanaluzabob.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135525e20dfd---zololawow.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca73208d7---rimofonusinapesuzipavun.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/20811906085.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d5108a30d---ratejipedapeluborerob.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/fevikavalelon.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-8/20210908100013580442.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/20541064332.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/67975987837.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/17282254185.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/47481537158.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/98691300016.pdfIn PDF document text
    • http://vip-cond.ru/userfiles/file/73872965156.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/rapofinim.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/bamutunogesemu.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b82d1bbe---susojidefakofewifivebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=inquiry+into+life+15th+edition+pdf+freePDF 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_off0000cb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB95 17112 bytes
SHA-256: 00b7b6461277f4de976155b0133b45bb6c94e76ac80e228b9f77423345110427
font_01_sfnt_off0000f807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF807 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001101e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101E 10760 bytes
SHA-256: 6e7872176850e99d12825c13b054909ad147bbfc6809d95bf8ca0ae47ec00a2f

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