Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1bff37e36211114…

MALICIOUS

PDF

103.0 KB Created: 2021-06-30 06:34:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a6a97a4e658ab5758522f6fd36fd013 SHA-1: 7d6ce2ca1f158c870c663178c2921bcb7d1c78f6 SHA-256: a1bff37e362111144e14ece319e054c720016c134061dc378581ad716e50b3d7
196 Risk Score

Malware Insights

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

The PDF document was identified as a malicious advance-fee scam lure, likely intended to trick the recipient into paying fees for a non-existent prize or parcel. Multiple heuristics indicate the document is a link farm hosted on compromised or disposable domains, designed to redirect users to malicious content. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607635c82e2a4---26520164436.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b727d396eb---65076346150.pdf
    • http://alphasigmaoverseas.com/userfiles/file/xavurumakutol.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/78e88b2a082fc1227421c64d11fd30fb/31566762766.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/182754eb6f10e2431aee1e0fdd0cd9d1/merofazegupomifiwada.pdf
    • http://oryginalnedekoracje.pl/userfiles/file/14637721348.pdf
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/64c0beb6ed3880a852ece50ca6d5c07a/vasaxoredakonugajeze.pdf
    • http://sam-global.info/files/file/busarer.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/57tosplpm752vf4gj7sknoif89/95656269204.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/atv7uiajun1d2hg29rurp993jf/magodipasujudo.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/8nlmfciae1p7vtpo5o93p97p3d/16910042084.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0705feef04---40194336027.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/98d3a66b1ec6f4f11729e3ce09754e12/97171268230.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/9b01f99d08a824991670b873d0e658d5/96220475672.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/d84a846d9a8d78b157b51eecc905a52f/23683965498.pdf
    • https://psychologgia.pl/Upload/file/17872901096.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077270fe0c94---pezibimesibesivefaxibukag.pdf
    • http://dui-antidote.com/images/userfiles/file/xujexutiwamalopusujoduru.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607122c7afa8c---genuzofopivisob.pdf
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/66014698776.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/8eccc97642455e5bcf4c01186b53ca9c/56830918839.pdf
    • http://fecoil.com/userfiles/file/mofurudofazulowe.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/466f298b31f7396537316fa8dc0bd5be/kamunaponazoxerezemewufot.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=hurricane+spin+scrubber+troubleshooting
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000131d8.bin
1dbc7f25935a3c8e3ad0c46762e60b1dd6e1d43fc365db4dac3d0d107c963590
pdf-font-stream PDF embedded font (sfnt) at offset 0x131D8 16740 bytes
font_01_sfnt_off00015d9c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D9C 16792 bytes
font_02_sfnt_off000175b3.bin
32550ff2260c8ff5e90d376b999ce42f83195ddd299ed98639836b2125a4d406
pdf-font-stream PDF embedded font (sfnt) at offset 0x175B3 10884 bytes