Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6e1ac03bf83c45…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 13:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2a9557ccd8e524e5ae120b22a87a68a0 SHA-1: f9dc51cdc9c9012df26da357adff8d4a55ca8da9 SHA-256: 8d6e1ac03bf83c450276266eb2d7851cc71979ee85759c8bef9079b5c00237aa
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. No scripts were extracted, but the structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608517e78596b---sipaluner.pdf In PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbc2ae7201---96974883455.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16096ba6433db5---81701962008.pdfIn PDF document text
    • http://partnercable.com/files/jezoginidolajozilevomow.pdfIn PDF document text
    • https://beaszemin.com/files/32302507914.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/74035319343.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210825221514_5yfi5b.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/visaxaxiwalibabidenun.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/wozike.pdfIn PDF document text
    • https://bio86.net/fichiers/55763264733.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28958ea7eb---pivot.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/nepudumivogokatudesa.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/namazojatikuli.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd4730a1d---39046732814.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/libaveb.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd8d3814ef---16693592410.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/vamesokuzes.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084e5dd208df---86341615303.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acb652ee197---vofepodubog.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/60865562165.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/ebd0094e3ba7ce523a877c8a44da4358/rabisutolusirol.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/resugi.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/17992683637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+book+for+learning+python+for+beginners+pdfPDF 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_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 19268 bytes
SHA-256: f53c487e93ae43a3a24cd77663f2247ee24ef2e7c44f68e77d37a648cea8f120
font_01_sfnt_off00010cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD8 11176 bytes
SHA-256: 53cbccdcdad18ac1b9876e05a1c85304290601c3929c94f70e905506b53ddd19
font_02_sfnt_off00012698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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