Malicious PDF — malware analysis report

Static analysis result for SHA-256 4169b34b9059111e…

MALICIOUS

PDF

90.9 KB Created: 2021-06-28 19:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 710b9890b2bfd2d44b887ff16a57e60c SHA-1: ac7bea99a6a0f26379a6e71368bf8862ae354748 SHA-256: 4169b34b9059111e9ff5cc4dcd1069beb8fe7ef44994f9a395908a4b13d5510b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm and contains lures for advance-fee scams, suggesting a phishing or fraud attempt. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious intent to redirect users to potentially compromised sites for further exploitation or fraudulent activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chongthamnguoc.vn/img/files/37719778421.pdf
    • http://immobiliareborghi.com/userfiles/files/2326959151.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b132464265c---42383655762.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acc3fe5ec28---66865748342.pdf
    • http://lt101shop.com/userfiles/files/xekapuko.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/50eab5de3dd1eb62c665063ce2a338d5/gowotilegizexuwimegigij.pdf
    • http://prof-cosmetics.com/upload/files/90028531662.pdf
    • http://dakmet.pl/upload/5525411898.pdf
    • http://tfh-filter.hu/_user/file/55818336909.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/q1agk0hlgv7d9s4uhjiugqo417/fesesumazera.pdf
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/rulubopizuserazunubotuli.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de482dcc7e---lotebukanesofevogir.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bd71870fe---vagob.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c482211a8ab---sipewidadof.pdf
    • http://aep-tc.com/cache/fck_files/file/19928598600.pdf
    • https://chpcentre.com/files/file/19610033099.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd9d9b0066---julofoju.pdf
    • http://mofrantech.com/userfiles/file/91637922363.pdf
    • http://msinziniering.com/userfiles/file/suserikopemiropemizegu.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b6cfbb209---30164374227.pdf
    • https://feng-shuiworld.com/userfiles/file/70864164030.pdf
    • https://comobrew.com/newsite/images/user_uploads/file/mawubunezawomu.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca8b1d989a---pitixirenesawi.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080f1fbd039a---vanomawepike.pdf
    • http://mp-journal.com/media/file/pezavagabolep.pdf
    • http://wittlich-luexem.de/userfiles/file/22760980546.pdf
    • https://bomberosdenavarra.com/userfiles_nexo/files/47573094614.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=import+pdf+to+s+note
    • 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_off00010187.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10187 16792 bytes
font_01_sfnt_off0001199e.bin
ee3964a964ca482959fd6844f639e9435815e7fd87c6eb1203a303c3940ca428		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1199E 10308 bytes
font_02_sfnt_off000130ca.bin
05e946f05ba7a2d180f60dbb1ce98acdf73db9e23821a9fbd938c1028e443292		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130CA 17416 bytes

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