Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c70afe6af129f5…

MALICIOUS

PDF

98.7 KB Created: 2021-09-06 18:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3169d8f9027afacae14db24c1cf68d41 SHA-1: 9ed4de09778fc1817969c25af9cde2aa9a0118bc SHA-256: 96c70afe6af129f549ae619551e5a314ca020dd66845c75589a4291425c8e595
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristic firings and URL analysis confirm the link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://gistys.com/userfiles/file/zexowu.pdf In PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/0f8575530f813698edbd32511f33792d/56342941799.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2edfebfb5---magukogenisuperovufod.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089e5a3a706f---rizobox.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/wexoxerajugabesudemi.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/34629b3408ee06d4db4363d1d8f57ac2/boditidaduzunozufov.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/43n8cr1mmqq0i8al9nife4sjp3/88527703235.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/d960e90cf3c04cc45d2e5f051baeef8b/73686099088.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dd64c2f3e00---kepumitopoviwozam.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jdg0l36gainlovchj94q799gn4/xoxitunigirejulowive.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/609178b2ea4afc96d62c798bbdb2f5e1/2617489685.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160827c8531951---bafakovuteferofizofarof.pdfIn PDF document text
    • http://aven.su/userfiles/file/43738967922.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/sarajupoduderudirobobefe.pdfIn PDF document text
    • http://euroinstytut.pl/galeria/file/57496288780.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/98269739959.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/17b82a7f4b5b4e3c80efb9ecca015ef4/filabevurasalebedibajo.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884048870e0---wasatisipunoleruza.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/6151a12958c610f94379b9acdbce126f/ruzovatogaxuwokupop.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/sevepavobanifiwiz.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/vivuvumesaz.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072947e51b8e---19113770665.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160dc677e10369---17617947059.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/jadiwizugumadunegopat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=goat+farming+in+odisha+pdfPDF 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_off00011a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5F 10808 bytes
SHA-256: 7571b28b87a48e6b240e2dc73d74e2a1e33bc0b608bc23436d00f66c42f11717
font_01_sfnt_off000132e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E8 19524 bytes
SHA-256: 9bafa48588f7a04fd725f5360731d0a929a42b8aa61606aa93c990ce61dbd9cc
font_02_sfnt_off000164db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1