Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2fd6a1ceed6fb5c…

MALICIOUS

PDF

92.2 KB Created: 2021-08-10 02:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 22f45a3ebb71a5c40f30948e482c40e8 SHA-1: e131685d664d9c9260abde9d7336a897123f2bcd SHA-256: f2fd6a1ceed6fb5cc6432d4db0e4a29e28ac1aff25e7e2da09fd68fa2e40615b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or link farm attack pattern. The presence of embedded URLs and the PDF structure point towards the use of techniques like Spearphishing Attachment (T1566.001) to deliver users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://catamma.ru/uplcv?utm_term=tommee+tippee+perfect+prep+machine+is+it+worth+it PDF link annotation
    • http://seamacros.com/upload/file/39332320246.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/7f2cbac30ccc3a8bae52c988067826ab/kotexoxefolofat.pdfIn PDF document text
    • http://theprintfactoryvietnam.com/uploads/files/xidabubofowerobugamawix.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/lozegibojapuji.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faf3210f116---zedirijiriwimiwapolom.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/8395337184.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/tthgs7gjhbhnm7ndetn45f1k9e/59398856984.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/rupuwotalen.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/12237c557eee730645d51a17c14c3219/51997223439.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/20913964582.pdfIn PDF document text
    • http://lawngo.net/fckfiles/wivurigilesadawot.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/aa8f3e381cc3f75e9ba54b56ce82b24e/19113038975.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b37c75af40---lifupofunedubo.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607231f81538f---39474482747.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/duvavinejilexipixo.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/korovujodokunowiwibijas.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/momitedenipa.pdfIn PDF document text
    • http://www.seja.lv/assets/ckfinder/core/connector/php/uploads/files/suzelazo.pdfIn PDF document text
    • https://landbar.com/upload/files/34087145587.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d350b0b976---48560358572.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/pibirewepomasafafigej.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/viwojitebulogedexidapal.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/57881133490.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/33226025914.pdfIn PDF document text
    • https://ancoraeducacion.com/images/wutedagediz.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_off00010336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10336 10748 bytes
SHA-256: aac0e8efa35076592f537ee365ebbecd7eb943d7b09a4a712cfd108332dff9b5
font_01_sfnt_off00011bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E3 17408 bytes
SHA-256: dd667c2f3eb8af98829279994632b0008f4560e4f5a00e0e7f76a5762a68af2b

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