Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a31e204eec38657…

MALICIOUS

PDF

85.8 KB Created: 2021-06-30 07:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e31e4fc9078f566643ba9a44488bb107 SHA-1: 73cd735dd7349253e5855c03a9e81c7fee20fb84 SHA-256: 9a31e204eec386577e013dddccf215e53e7577f347e1a06e9a9a6d5557a6cf6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites hosting other PDF files, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

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://deltools.com/userfiles/file/gomuzabokup.pdf In PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/7ac754530fe06808b168a8ac6cdc76f9/zemodulinarunawananage.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/65502704318.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/90423907585.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/sajaxepalojug.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/3df4c54ec5bd2dabc2585cf8ced7462e/14945675225.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f28ada06db---fuxakigog.pdfIn PDF document text
    • http://falerisztika.hu/tmp/fimubifizosaditesufefuk.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4727899875---rekopipurene.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af63e4314a0---88282504537.pdfIn PDF document text
    • http://parentini.it/userfiles/files/lapinanazesifofolodi.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/namanukixe.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/0138c09948d7118441b622201184c4b4/gidovabi.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/26511559084.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd225b9082---38404986201.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/232d791eec16fb99a5f981e6df8aaa0b/keriximuguxona.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/daparelolivulumusux.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/84859645857.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce1c9dcc91---wakamafisedipewujazodir.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/kudikegutibave.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/69909432375.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/jepesi.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c7fb28c02dcdf5b29eff5ae2e10a66a7/45349404703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=gta+san+andreas+apk+obb+highly+compressedPDF 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_off0000e98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98E 17516 bytes
SHA-256: 0518c7d686ea5e18d83522db1da9e394f5e93d21aa60698e4575160112528bad
font_01_sfnt_off00011779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11779 11344 bytes
SHA-256: 14a7434dee42aa5c93c28ed5fe485bfd758271fbc35ddc3e20d640f96553d5e0
font_02_sfnt_off00013196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1