Malicious PDF — malware analysis report

Static analysis result for SHA-256 8afc6c282fdff979…

MALICIOUS

PDF

85.2 KB Created: 2021-09-02 06:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 429babe0e7ad0beab1a8d80c4c52c757 SHA-1: 1ba33855cf54dc938b0d195fa5c263a23aed45cd SHA-256: 8afc6c282fdff97956065f331988a8ae737d6113612caf949efc266f464545bc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://fairway.cc/images/blog//file/sagasidojosulonedutatedi.pdf In PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78a5de1a1---genopudanaxujufewasusuw.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/bizemagolodemopavewixik.pdfIn PDF document text
    • http://fygl.net/uploads/file/29213148402.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/43872373734.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080cd9215b60---61492158849.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/vepob.pdfIn PDF document text
    • https://ms02bet.com/contents//files/87349389525.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa551a9e5e---2027615485.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/9897ac9db0f5a174fd4d7ecd00e4ac73/43663828357.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/69041733209.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/mapel.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/1b97438940fb3fd82885fbf63574978d/gezafujubovej.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/12287a05c93b4c45e283a993ffa42000/36070664697.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/gudifoxadulimu.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/10523671628.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/61659428295.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/d0f39132e047afb650196546fe67d843/visodifusoxar.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/sajejirajulepo.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/4306047749.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/96682982429.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/58681455019.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/317eb0ee1b2792a7689fa6701b16f3df/pojejujoxunokafifuvamosu.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/86589237306.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/gumas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=r700+sniper+call+of+dutyPDF 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_off0000e47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47F 11044 bytes
SHA-256: 1ca763163ff68e81b915d0c7759cbc41fee12a6adb26d2b7a958f90108df22d3
font_01_sfnt_off0000fe6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11681 17916 bytes
SHA-256: f2bb83ba3ce79faddec23d801f90593ef87cd1e5275757933c95042fbbc112a4