Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb8f92d6230cebe…

MALICIOUS

PDF

76.4 KB Created: 2021-09-04 22:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a784626e41cdb6749d823c4973bd2c13 SHA-1: e3a9e2aa472a5d3b9101826a5ad119ed5ec2ba35 SHA-256: 6bb8f92d6230cebe31b927044466fdd482ee68363f83f4d3d9a82cfef533ddbc
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to lead users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The presence of multiple external URIs and compromised CMS upload links suggests an attempt to distribute phishing lures or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://synerhu.ru/uplcv?utm_term=proctor+silex+iron+17202+manual PDF link annotation
    • http://vidol.nl/userfiles/file/jaxemamapajilojabini.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfea29c6c1---darunanategumawivu.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a4fcd8151b378d65517bd52a2ca6f646/99905487005.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/a784d543a49025767e5aaaf9f27f1848/34505515587.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/84948330109.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/97859236998.pdfIn PDF document text
    • https://tmtteks.com/files/95612153364.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2aa4a1899---pedoxudus.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/4c314ba156d1d173729d0d39d9c1d1af/xozolutuvawaxetakodele.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/taxipujebezaxobowaxin.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/luvefuzeva.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/naxidasok.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/28927735254.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/92536761677.pdfIn PDF document text
    • http://centrons.com/uploaded/file/6159636936112dbf1c3b50.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a008bd9dc58---ninesibasabujuxutejuwo.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/71298278410.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16125533815f54---7660590724.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbae4cb3f8---lovolupito.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/ebdb123f505716ef01255744b6e8b45b/20708322565.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/97485249653.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/87654872474.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/belibedisajuvutupo.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/85813773716.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/5d0d258f6a2491ea93445013ce0ac2f8/5964202983.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_off0000c4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4FD 16988 bytes
SHA-256: 4b01deae1caf42a61d8c7f6f800af957a2819e4eb57b2f07d48c77ad2f6a751e
font_01_sfnt_off0000f161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF161 10940 bytes
SHA-256: d0b20ed3f70049041700c94200c982e61c1b23bab888c0ecc17c9162f31e6827
font_02_sfnt_off00010ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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