Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a37148a875250d…

MALICIOUS

PDF

98.2 KB Created: 2021-06-29 12:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e8e4f88148c9c13b6eb47b1ce1f9938f SHA-1: 8d2c9595c157774a57cf6769f4910bd3f567c8d3 SHA-256: 92a37148a875250d9560b6d6cbba50f1537d90e38cf55117be6008f9ffc141a3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The heuristic 'SE_LOLBIN_RUN_COMMAND' firing with 'curl of a vector' suggests an attempt to execute commands, likely to download further payloads. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://cualuoihoanmy.com/uploads/userfiles/file/87352792543.pdf In PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077324a9804c---47556915779.pdfIn macro / runtime command snippet
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/qtrkelpsvm3u2u5c601e8k0sk1/bewimik.pdfIn PDF document text
    • https://spacio.hk/attachment/file/kafawutugi.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/bf3dee38625ce7589368d49925d94d3f/geduginotitedow.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/mevajijowepamorodefux.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/kobuzipok.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/lomazejavisetif.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/fopulefa.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/rewezojujob.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/560b8b64b231d9c17eff6d89d419d036/womikujolenil.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6d8c15fb6---84454565885.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3066c0f84---desiwogetani.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/kivegadikalokuradipaluvi.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077e1f6982c8---74372476356.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/61154617795.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/79768326290.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/6df2a1c12ac8413ec13b7e12f27a061a/bimeka.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/28011560033.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160824f5996ef7---kekoronifaba.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/44a4d339cbf7ff1b29a9723823be68ec/zitijiparugikaki.pdfIn PDF document text
    • http://balone.net/_upload/file///woxinaronor.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/c2137ae768084452f4eceb76defb08ff/78690302943.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ech0vaak757bmpiulenq0sd3j7/90479950676.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfilesIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=meaning+of+curl+of+a+vectorPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10116 18776 bytes
SHA-256: 5a473950068f9c7b1a94a568f753477d5337238ceed4cd204a4a969aed6d2afa
font_01_sfnt_off00013360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13360 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B77 10504 bytes
SHA-256: 64e38a21e5d3a295a8622a32b16b64d59db4f3bd568521a13d333c8fb5a899cb
font_03_sfnt_off0001637e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1637E 16560 bytes
SHA-256: 38e6d1a790b6142bf497410e3d6c2d74eb744ac920c513bb577b2f64cf473a86

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