Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8b887ae1627c93…

MALICIOUS

PDF

177.0 KB Created: 2021-07-03 14:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 97a8fbd8b5de73a0b617ada50196552b SHA-1: fe285a97e39fd007c91344af924b835b7694c260 SHA-256: df8b887ae1627c93593120cdeccbe4cafff9d3f468c27f86033ab21d36919535
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution lure. The file functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of multiple compromised hosts and disposable domains reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9738

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://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745d3258965---xosetajeluxo.pdf In PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a1a2cf0ab3e10904b19f3f22ac17575f/jazisunodowekabebisoduw.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/9af0844be802a705bd5b5d6ccaae97cb/22461003123.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/17796992037.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/wevalaluzabid.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/dceedfabcd66ed2b6f811738f7d3a88c/vebijaxoxatunujijowexoje.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/susekofufitolipevo.pdfIn PDF document text
    • http://prosquash.by/data/21868961827.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160902c5805236---2042486271.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/210505c4992b7ddb332389876ed4aa81/4955932586.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607c692a6baf7---78162910082.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/vezurusukawelo.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bef9f4e14dc---90113242612.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c951bbac327---52180202278.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070cbf7f221e---96569010692.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01f716ff1b---86439217408.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e303c88d90---37940661890.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/rekogamerakivisanuponira.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/833879cbba32d7b0fe43e7a575dcfd7b/43097256809.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/796f4b9ec32e9317175760607948ec97/71820716186.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/muzugudovad.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/5suhq5hrt2jh8r3oftu8j3q104/15251029125.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/kibipavuditipeji.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/90206771850.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/zemazadomixopakofogu.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/selulolivifemizufila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sqlite+query+syntaxPDF 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_off0002542c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2542C 18728 bytes
SHA-256: f82127c494f22809cda9eb7b26b933c5380a81cb5be1a3e50d8b1c90d819e68e
font_01_sfnt_off00028648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00029e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29E5F 10516 bytes
SHA-256: fe232cabdbe73e9ec35a50e8b8418e36e00a787718504bdbff573322ae3229f1