Malicious PDF — malware analysis report

Static analysis result for SHA-256 735e9aadac6c7e14…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 11:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfa4d7b02f88fd2eb1584b784dc5d86d SHA-1: 817f329a9db3fc8f813d751e64b9f15632c6a0ce SHA-256: 735e9aadac6c7e1441fbaa68e4b39e628c2b12db8133e3785f3bc22ae662ec8a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tacchigroup.com/public/thread/risorse/file/rifederigono.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac13e50a57a---211668686.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084279e71886---89631731576.pdf
    • http://synphabase.ch/upload/file/dotulapo.pdf
    • http://119pump.net/d/files/15793651107.pdf
    • https://siam-royal-view.ru/data/files/10605663127.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfdace6e0b---5673355334.pdf
    • http://toyotaquangninh.org/data/dulieu/files/5529974661.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2ca5337863b7428255d1cb9f12a77d19/mewimewezasebotupoma.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/5c1526032fa33a5d4d3564c4fa86fb29/wakasekiroliva.pdf
    • https://barrierball.cl/ckfinder/userfiles/files/72739205425.pdf
    • http://school19-zav.ru/userfiles/file/xagit.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608be985eaef1---63215290315.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c92b536e1---80836918114.pdf
    • http://directartdeal.com/uploaded_files/userfiles/files/38346996155.pdf
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/86385003765.pdf
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/44473069758.pdf
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/92120169323.pdf
    • http://j1medical.com/uploaded/file/wopada.pdf
    • https://anmoul.com/userfiles/file/lokidigokogivoma.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161330996705a8---tuvogitumefaroguf.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b0a92a9496bd41c4b24f38e3384c342d/6809742652.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/f483a177881f704937ff4be29d1e64eb/tedizodisopibegiwuje.pdf
    • http://daydreamspin.com/userfiles/file/ganipekaduwamodenafig.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=failure+mode+and+effect+analysis+%28fmea%29+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e405.bin
6cd145a21a6e29f873dd8c8297176901e0703753ad035ff127227d75218f1565
pdf-font-stream PDF embedded font (sfnt) at offset 0xE405 17696 bytes
font_01_sfnt_off000111c6.bin
5afcf33fdaea932afd4c307ee30530375a30a77bf9662fd2f3c65e18e79bf2b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x111C6 11128 bytes
font_02_sfnt_off00012bde.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDE 16792 bytes