Malicious PDF — malware analysis report

Static analysis result for SHA-256 a712433136f150db…

MALICIOUS

PDF

98.8 KB Created: 2021-08-13 19:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: b6aade35e62f416dd99461f4aac7db99 SHA-1: acc186145c81f4f9a1c72a4e6eccf5104838520c SHA-256: a712433136f150dbc9f64e627929cb3e50abcdaa5a80904f548acc143924d823
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is likely a fake invoice or payment scam. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely serving as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/7ac97f9be35937fff0c533ed6062d84c/wonuvas.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a375b525250---vawarivijodetewuzunalikun.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609833ab5692c---peroziwerasigapexixeliduv.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/soteboxabufozukodukamate.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/vasobobakob.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/35175775369.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/9asvdba3e62kbh02aidtkp2pb2/33233977015.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/gipikukuzilugirimazesis.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9841a0c0b53e61523a2293c00efb2065/pasutiponodekebetifiju.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc2e5cc4c1---22217884950.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/75124840991.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/15162655839.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/f2370ef495060fc5a53d5196296fe6ce/tamananufiwipekofu.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084afb51c6ba---finevok.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/3854477943.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/57943814220.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b6e22ba0e---88586640465.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/d5fa339ae09378118b7b337665ac680d/31809575904.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/22946559319.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/dexunujitipimipe.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/lomenowatesolokovopesoki.pdfIn PDF document text
    • http://siembra.me/uploads/files/vupofixori.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c5b45274561109c652c533a2903fe31a/74077625250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+fill+certificate+for+aadhaar+enrolment%2FupdatePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF0 10928 bytes
SHA-256: bf2a3da9846d3ab435c69c62cc675b1c6539c3104877c6829e0ca713ead670b0
font_02_sfnt_off0001380e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1380E 17020 bytes
SHA-256: 196db7cd75de6f91851cfd874027a165b5886c493a457c79e8e3bac8c66fec54
font_03_sfnt_off00016470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16470 16172 bytes
SHA-256: 637a9dac0afc585f1f105c2de408df99420c2eea19216aca5c902ef31b2be0e3

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