Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb44b642a3902a35…

MALICIOUS

PDF

71.0 KB Created: 2021-08-30 03:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 88c9966ad8766dc290bed1495aa6945c SHA-1: 7e7906d86a7572bc285e55950e922e528ab46dfc SHA-256: eb44b642a3902a357665061f393ef1d30c9fa0906569284bb3dc0b37732e89aa
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, serving as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pistant.ru/uplcv?utm_term=calories+in+fried+potatoes+in+olive+oil PDF link annotation
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c900c82a791---gerovifipudedera.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/d327jqued7q06ahc4ogv9t45ed/34009598111.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/35845909899.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/sixepubefezifetobune.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/15686220486.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fa4112ee4fd7bd69031fcf03bcc87024/8677971951.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/vefivaxugis.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/detasisewevagubawozisop.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/90279189286.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/zetoxam.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/60890036118.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/77334575652.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8a6d8bbb4---rakesunanupibupipitizos.pdfIn PDF document text
    • https://citronel.com/userfiles/files/jikoja.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/xokudug.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/xonenuxib.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/xaronilepa.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/xubalirebef.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/7863815b1c2a3d337672c735d7511b95/xotepojovegarolu.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/64159785291.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/98a6ada6e310ca6dd8ed685d7954b9df/91992332104.pdfIn PDF document text
    • 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_off0000b4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F5 10588 bytes
SHA-256: 36bdaaa6cb0d6d6a004a652ad135fd4c6dc1d8eb1458eae35c6a7e422f03c8fe
font_01_sfnt_off0000cd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD44 15924 bytes
SHA-256: f356919ddf0ef059ee6158841888f3df0d774bc4b842d644c15ca744bcb49879
font_02_sfnt_off0000f633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1