Malicious PDF — malware analysis report

Static analysis result for SHA-256 4146c40996d2a0a2…

MALICIOUS

PDF

103.5 KB Created: 2021-06-29 14:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd6aae31a008a18e2d8cb2b6f7ae0e98 SHA-1: 5c0c87340886626589efd6cdc840be811a4fa5c1 SHA-256: 4146c40996d2a0a2a469bc018c1c75f0c0044183ddaf885fb6125ca1882db0a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/6fc089651e4dec841eaa88487531db69/87006463925.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/8ae9a739784fb1053f6c00cd94586485/wunirekiwimugaramovoxi.pdf
    • https://profipreklady.cz/www/ckfinder/userfiles/files/vaxoxovi.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/75960720366.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/a0b9c3311cf3446486fb6b59f0923f62/60539168089.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160828703653c9---63645329178.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/dcd7bf01cb3191051d19472d07635d81/gedevolineku.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/2468c068f295cff91e7e37befa212e5e/mobidimajokopozobezu.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2db8120c---96642841198.pdf
    • http://studiosimonepantaleo.it/userfiles/files/wujojupi.pdf
    • http://shiraz.sk/ckfinder/userfiles/files/soxusezedagugemedoronid.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaf43c7697---75304060664.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f101167724414f2424565122cd331528/fudefaxekifovixexox.pdf
    • https://tolgyesvolgy.hu/userfiles/file/vidugo.pdf
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/63b2affc1670e5ac28d5f2e685073d42/xiborasixoditudure.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a613c986c81---mukoruresilaguvawewixo.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/3c0gpkj3up8rhl0tmq9t7ie1al/wikosunijijadefitoleje.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/d7n3ournnvaodrdns9ron2u381/bijinasotam.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1ac67d5d9---jonomegubajigufu.pdf
    • http://atol-res.pl/uploads/file/22651540931.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090aa515bcf0---61959280211.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a3b633b3c---xesiseto.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608185d32c78b---34390626177.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/f47285515bdc0fpbh6s8v0ciji/35626870962.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608abbba9d96e---momudubelekokenegugipexiv.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=appropriate+null+and+alternative+hypothesis
    • 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_off00012fcc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCC 16792 bytes
font_01_sfnt_off000147e3.bin
eaeebb1592babefda951bb632b88ed986e8954a68685a5b60abb913525b34a89
pdf-font-stream PDF embedded font (sfnt) at offset 0x147E3 10752 bytes
font_02_sfnt_off00016096.bin
8f84f36866a8264c28e0db75fca4c219ff407b703f8f13edafab8fed0abbdddf
pdf-font-stream PDF embedded font (sfnt) at offset 0x16096 18196 bytes