Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7586e3c90a7dbb…

MALICIOUS

PDF

163.0 KB Created: 2021-08-19 07:36:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07705fcf274f1b77715f0e27b9637f1c SHA-1: 85ed87611582b9de3778607983e58b4242450bea SHA-256: 0a7586e3c90a7dbb3ab1c0ab9bc548a3573f3e9a38506c8aefb6b6641c488ddf
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9734

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://krisoc.ru/uplcv?utm_term=strong%27s+concordance+number+199 PDF link annotation
    • http://www.motionmantra.com/userfiles/files/74813172503.pdfIn PDF document text
    • https://amblamy.ee/upload/file/duzuvadigere.pdfIn PDF document text
    • https://tavfelugyelet.megujuloenergiapark.hu/admin/ckfinder/userfiles/files/33197482345.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/d05pggclq5pdnati62evmgpbek/80946260304.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/ea27ded0374a1fd3adf7a58e38eac814/lajavovowolev.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/7366669569.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910cdb92cb2---4896533218.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/72076419548.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9c3c7878d4ca325b0de1d98940e0fa9a/gosof.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160856eddac3f9---87999172038.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b1fe42f2---loramogeduf.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/museta.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/5b3db5b07bd5085dc0dba203bc47f57d/gutewalivuvelisisepezebo.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/71681365207.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075d3129837e---4128394146.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/011415433441.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/tenubekotolojibeweguvon.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/29477410195.pdfIn PDF document text
    • http://kd-council.com/upfile/files/17567663107.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/26227553726.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160729b4383995---zukubepekomu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000200af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x200AF 11144 bytes
SHA-256: bec46c1912d3f7e94d6e2061cf6aa0f51ae0ec0c229d69ab4121cadc84ec1b50
font_02_sfnt_off00021a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A9F 33688 bytes
SHA-256: 42a2d80d807d365493923cc7d816f27430d58550415c497f6b985b8b6437d5ed
font_03_sfnt_off00025e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25E3A 18204 bytes
SHA-256: ce38d7bca189c5f7ed7fb3b7edd2d879556f837e69e8e85977cdabe3adebcbde

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