Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71492f6a340d81e…

MALICIOUS

PDF

79.9 KB Created: 2021-07-09 04:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4461ade708fe2048982125e05c1953d3 SHA-1: b3c4f0c3526061f0a9376546e0fe089d78c0697d SHA-256: b71492f6a340d81e3faacbc023ceb272b57b913a24d72867df139541b8d34b96
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to external, potentially malicious, content through a series of redirects and embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 http://dagmar-e.de/userfiles/file/jedokuganimotuja.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd38c118bf9---53565427960.pdf
    • https://ludifrance.fr/userfiles/file/kidufosinujiruteduzukolor.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/r5tj5vci4qkqhhni05jtcj0tjk/rebokelepiloj.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea92932346---taniruvoduwufexor.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab779656ad2---kunebomibuzodivewi.pdf
    • http://haiphongcontest.com/images/files/zifademesogigaxa.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/5668abf2f9f0897a27b64818e9a21d2d/43790796172.pdf
    • http://www.contectrade.hu/fckfiles/file/jiburewiwo.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085592fe5e69---paliwokoli.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072f57f92979---kixaj.pdf
    • https://summit-christian-academy.net/scauserfiles/files/89514092094.pdf
    • https://hirurgija.me//files/33638837221.pdf
    • http://ipost.mn/ckfinder/userfiles/files/polomidasibizalejujozi.pdf
    • http://acril.ru/ufiles/files/32807411255.pdf
    • https://jamuiboe.com/webroot/upload_media/nukorupugisaxodakaki.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/i01hcod9qrjuvglkhirb7jj83c/manijenemaxulegigijox.pdf
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/2059365299.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/90028ce05c6034e0a84498a70d0df51a/supuneziduxuvatotebamezuj.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/bda4956f1c08c51ddd0c3838a8456c66/kevobibufogazokik.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608737a78074c---8159000602.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160764b768c279---kifiwa.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf92fcafef---daxebenilawad.pdf
    • https://norservis.cz/files/files/64429547125.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=schottky+diode+pspice
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8d2.bin
d725bc67c0fd0782ba549de3fb4e179cf01fc4c4b461dee8f493c466f5e1ab99
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D2 10480 bytes
font_01_sfnt_off0000e0cd.bin
9570fac84c7ce9c64cdd49c04e45b6f9ffdbbea38222e502ea0a87a8f94ee9f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CD 2728 bytes
font_02_sfnt_off0000ec4c.bin
2ba1436533fe44e2169670a5d20c7c02141d341b687b19fcec8a0e6e37edf681
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4C 17264 bytes
font_03_sfnt_off000119af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119AF 16792 bytes