Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5abdf057471b74d…

MALICIOUS

PDF

90.5 KB Created: 2021-07-16 01:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b22b85446b108ebcbca0225fe92b3882 SHA-1: 7be3d2b5a8c9aa14edf104097d373b32c419ef7d SHA-256: c5abdf057471b74d5287789d99b30bea1f4fb5df701cca918c4c03de32515878
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve to redirect users to malicious content or phishing pages, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://m-co.de/wp-content/plugins/super-forms/uploads/php/files/hup1uoamb6pqp703dp1tva1duf/foxumuzubamegunalidemu.pdf In PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/eba6489f37f808632bbe1a8d39a11bf4/fabosofebimapulefobobubo.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/87333bb6c05944781453a7c52ba4dff2/60879310702.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/b7973ae789ee8181a52a612dadca4d3d/16949342390.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/71442498752.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d15a11b86f---51560636040.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/a2b914ca0f1e7aa461912ba499ecddf7/24412640691.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/18062302019.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160dd654575b9e---jabifaki.pdfIn PDF document text
    • http://ned.ru/uploads/files/titiwalug.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/latasuvoguruj.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/8b34f422652f1471b131a1506a782175/31324044623.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/gotasoligara.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/28175025695.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/f14c24c65c379e282b0098cc7f2891e3/venifamifirolavaduweta.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607698ac20386---bafejulow.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/2533050038.pdfIn PDF document text
    • https://raptiherbal.com/ckfinder/userfiles/files/pizapanefogufotexexod.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57fc15c142---93382034981.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/3058201788.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/22970687740.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883a8b81a14---rodixewabojuja.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/a9a1e8e9c59542c6c9019f3a2e4e4a87/wodibijopem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+hold+magic+mouse+2PDF 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_off0000fcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000114d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D9 17848 bytes
SHA-256: a824253e4fde26bad15148c76a03d8f3e22466e951a077fd98c48c9e77e7b84c
font_02_sfnt_off00014383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14383 10912 bytes
SHA-256: c54517d226ccf681febd3dd7e1a38db5ba6e91208ba145232716220998f02cfa

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