Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8ec66e5cfb819c…

MALICIOUS

PDF

86.7 KB Created: 2021-06-12 11:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 20684cc93a2f31d0aade5b6e31fa88e9 SHA-1: e9853dda9b1f7c6fb90d9055cf323bd0545036ad SHA-256: 7f8ec66e5cfb819c3292c7292cd7248621d5c940e773dd414e4f2d00dc3b4c1f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The primary purpose appears to be directing users to external, potentially malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/uplcv?utm_term=chop+wood+carry+water+chapter+summary PDF link annotation
    • http://acpiindia.com/userfiles/file/14418329250.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/dk93vijusoq6g5237hp9o40b3l/12439161448.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bcce3a6c3a2---38752836114.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/10e4237cfc2f7e99cf3dba9736be811b/13083388134.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/45b4dcc3f36602740876e88ea29e0cc4/93382381155.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160803c9ca5792---23598268200.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/4d6a251d0abcde487f61cf4aff336a59/xewowuludalitepobagug.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/1228180857.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/wisevigepizugej.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1e222cad8---54022526948.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c9mgrs47bh413ug851a2tgr622/naxenuxugofoxifemepijef.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/fufixudafifopitubokokesu.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/22cd13cfe6ab662758b496190970c023/93459276545.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/48390666066.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/ad6c110552f5606e41d291d64d61bffb/5029597900.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/27odue3f9etdeo5v4k0ng8g2dp/29876164305.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/4pe89iui6fa6f4q905urqbemoh/dawuguxagoxevugepufofeges.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000114f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F3 5380 bytes
SHA-256: cda3f18c75b7ea206325832868d09c7fce646ff30c256d76266ecbca64be15e9
font_01_sfnt_off00012727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12727 11244 bytes
SHA-256: 3f784331a2e46914ec13f7e08d5a97bd7357eb98db8febc52bf398446576fdbf