Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa7c8005f3870545…

MALICIOUS

PDF

85.7 KB Created: 2021-08-02 09:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 610566b3dea355b8a43338b731097a51 SHA-1: 35cb0f8030c012cb934fb822f17b1bc93650b7ea SHA-256: fa7c8005f387054530103443f0218a96cd618ee97ac8e2661e7a215eb82455da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to compromised WordPress sites, suggesting it's used to distribute further malicious content or phish users. The presence of external URIs and link farms indicates an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://smidgel.ru/uplcv?utm_term=maternity+leave+application+email+template PDF link annotation
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3e45d690c---13774589.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e71cb448---90454957781.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a824253778289dcd119bff6dcfeb4951/22686244524.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/samamuwojaguja.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce57c3c9ca---firevameze.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/dozewedoboxejirejogu.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beabcf1b513---12986355357.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3bb2ea61f---35179375842.pdfIn PDF document text
    • http://tort-art.ru/userfiles/file/jumuk.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/91690911873.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/dunib.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/nimivofewuwikuvipasot.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16105a035e39cf---kofigisirasobarakafuw.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/bitijasi.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/93228935904.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bipokazapivevivujifopo.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/kfojjejbkiv68varic8oitnrk7/zadukek.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a03991253---51488617160.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/76532779229.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/be10cb4dc5058147a8883011d97be3ea/89767166388.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/piralosuzavujaxosojubebad.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/76320654054.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/ms77olu4veercbbfs1o41b4kj5/nusemudenaw.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/765146cfbe3bc65cbea326bef0592ec4/xapejojodi.pdfIn PDF document text
    • 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_off0000eb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB10 17528 bytes
SHA-256: bdeee5b4c8d3428b6854baca0a541cefe48e8850787c1cd361e3cc7856eb179e
font_01_sfnt_off00011882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11882 10540 bytes
SHA-256: 447bc83757093bc54707cb5116b7e3c82bf582eb3d92deef07854830b19851e9
font_02_sfnt_off00013088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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