Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3a68a792426147…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 13:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4dc7c3bf58cd4f1bd5ae3b4adae8a3fa SHA-1: 99c743d2f5ce00e8ac842dd3c32a8205dec0a3cb SHA-256: cf3a68a792426147bdf8bbef6e9087d5d9d93005a06cd103b400ec0083b93570
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm characteristics suggests the document is designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://crewmak.ru/uplcv?utm_term=mega+iptv+android PDF link annotation
    • https://educhina.mn/editor/files/4629095595.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/lurajerobo.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/bedem.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613966cbc83b6---batipigawakig.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/teverosirawutilazudobob.pdfIn PDF document text
    • http://texmet.pl/userimages/file/vegipe.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/misej.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea5f91d259---823754957.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/6d4516be9aef14dfa8e73687ec129d89/61886044953.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/94300399932.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/wotufijowudizezepuvon.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/13255715108.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/xasolixemulu.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/17191025456.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/233dbad11a37483511022729fe64c9dc/bovoxutosa.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da4d9850c4---34525166577.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/42539817970.pdfIn PDF document text
    • http://euro-ex.com/images/blog/file/87067125166.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/5509793020.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/febijowavis.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/xipumoliwebolise.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/88598152049.pdfIn PDF document text
    • http://royalgroup.at/tmp/sujofolemomifimin.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/65948844054.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_off0000b019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB019 10412 bytes
SHA-256: 5b7190246e6e5d6ec097cfc487b7fa60d3627e9061a4d466b26bec74ab44ef21
font_01_sfnt_off0000c79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAE 16144 bytes
SHA-256: e447fc4dec906c5dadd643fc351c8cc364faac2a7111809210226b8b5e837518