Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55775f79ae16bd6…

MALICIOUS

PDF

86.9 KB Created: 2021-06-26 00:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fa139f0a99bc0583e521505148ceb4f0 SHA-1: 5fd3ec5c1f170fa2ff5ec336e85b2d432b840d40 SHA-256: a55775f79ae16bd687e5ec92ba0716a484bc3ecaaaf7834669b247772fed0a0a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These links likely lead to phishing pages or further malware downloads, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://huntic.ru/uplcv?utm_term=next+year+will+be+better+quotes
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/88bfju1qqgr33i7sogfp7gulrq/76303482748.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98b1abd999---rililomexigif.pdf
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/sumuzok.pdf
    • https://aronabritcan.com/userfiles/file/nodabevali.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfda7bd98e---paroka.pdf
    • https://firsatpin.com/calisma2/files/uploads/96830975873.pdf
    • https://rosewoodcity.org/nbloom/fckuploads/file/52850270596.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/j5ec8vuqhkg04ltc7cp3nnh8qu/lamokawobuzivosogoba.pdf
    • https://mfdesign.hu/files/file/mesegukususorumi.pdf
    • https://livre-art.com/ckfinder/userfiles/files/14890773288.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd68ff317f---fajowubixefeletene.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/c5a83ab2dff5d9614bd3f28745024d07/dikamivi.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/61af66b2ab28936f062ee826d7ff8e86/3606255142.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/abqpvllgfc2vc47ktp4dbk0q0t/30871855386.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7c6627bf6---tudovivadavirenozipop.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/1980l3ocpdtnht0qpbebl64pfd/duduralafasukelutek.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4148ad6153---12070933339.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/o7m3lo9m6bdaqggicoeffa2a27/41280137731.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d51b2e6738---8119482470.pdf
    • http://luvnchrlysenglishtoys.com/clients/861429/File/kodogifoxobi.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd97389c4b0---barusuzivunivoruwenu.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3691d84bb319e914fdf9a7b50dc255da/59217564787.pdf
    • 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_off0000eff5.bin
d0027dcab69fb0baefcb1d137b89debbce5c75e9901052ad085b779a2aa4a55b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 17888 bytes
font_01_sfnt_off00011d75.bin
6d6fa97861ad18be37119ac12aac7aceeac0de17c9f289741b0aaa15ea6335a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D75 10660 bytes
font_02_sfnt_off00013624.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13624 16792 bytes