Malicious PDF — malware analysis report

Static analysis result for SHA-256 33256bf56134fb0c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 09:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4f60df3b655b1b929038083e819d7143 SHA-1: db230db6e0e92b72f0dc8bd74fdbf7c994d6f7f3 SHA-256: 33256bf56134fb0c8c1a1b3c418203796df39b499d99679342adc89d339557c7
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some hosted on potentially compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://bygreenpure.com/userfiles/file/19121047316.pdf In PDF document text
    • https://moderator.lt/components/com_mijoshop/opencart/image/data/files/sogojazuzonifowiba.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/92128593793.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mtdbnq8gulth19t3truf4bio68/32611591887.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/6q10adgp6r94pmll5bvc4hb2f1/85296880472.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/irve2eicllj9dd5lsu802j3h2n/jegeguxil.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/20239156592.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/7097f47569c3f2fd6533258e898fe540/95528134152.pdfIn PDF document text
    • http://ddrwc.net/clients/869849/File/sosomokej.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa3370aa3b---sapilokupodugekuveboke.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/10552456702.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/37f21e11b968103e349ff0d6dc8aeba3/3365961629.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/lizetike.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/5778468050.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210902_7C41D26B0646E181.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/jepaloxewazar.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160943c3b841ca---tukupowotevafa.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/523f26eea06b7e773b3218c8a5360b2a/30402562779.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/87332825002.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/kawafipitabupatufajavona.pdfIn PDF document text
    • https://aashianarealty.com/file/wugenokobujidiwajulexar.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/fcfa1cb9f027abdd771396f165a73833/48772748466.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103a95abf357---12351776313.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=saline+county+online+court+recordsPDF 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_off0000ddb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB6 15840 bytes
SHA-256: 4fc159cdb9e670dc3c8c6869dd187b3a4753226813a01685112d51aedd0061bb
font_01_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 10652 bytes
SHA-256: d3362d56a77c8173a24048afbd97c4a547250a1f7b06d76e3dfd606aa277131b
font_02_sfnt_off00011efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1