Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b353c528a4b8956…

MALICIOUS

PDF

111.9 KB Created: 2021-06-11 06:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7585e5bf574e1976d357a5ae35f147ba SHA-1: 30d37f466f8f5404e14523c710d251bc02b0ca2c SHA-256: 5b353c528a4b8956498de37f647a1648271850dee26312830b9936cc4bd368ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to compromised WordPress sites, likely intended to trick users into downloading malicious files disguised as game emulators. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the nature of the link farm suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ketchas.ru/uplcv?utm_term=pokemon+gold+download+my+boy
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/0e0fbcd67001e4bf2b87c546ca343284/36170724053.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/firoxopepowiwatu.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/5834817969.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077b4d9dcaba---moboza.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/v1flturv52abbqlv435in531ns/45308919389.pdf
    • https://diedacorporation.net/freesiafiles/file/62469665822.pdf
    • http://www.odnpoznan.pl/fotki/file/file/bujipobudarisudige.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab102b191c295091ddd13937330373e4/90616826082.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/9vvvl8gpl7gu1hk3coa106vl1r/lugurasebubunudubi.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f82586ed9f---74335536094.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084b9107395e---jaranevepipot.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d917c5e2ce---lodegotiripose.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/33777200fe412d045e78bdd2526ae2ac/96487860052.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb5dd62109---sumurowenizeliximan.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9eb76afb2---60258026522.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdeddf21cd7---39451616267.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • 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_off00013f3f.bin
eed6984ec268e13c83c81b2e87d6aac85ae597cd0b853a08d71616a1ecee03fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3F 11780 bytes
font_01_sfnt_off0001646c.bin
ac722ebf2bdb1af50b779d16df02c33071aac21968411386c5066b709a226ee0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1646C 5268 bytes
font_02_sfnt_off00017666.bin
59cbada139bf643c2a5b7cb2108d21d60abe7466fc961bfb94f29b8f780165f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x17666 11896 bytes
font_03_sfnt_off00019dda.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848
pdf-font-stream PDF embedded font (sfnt) at offset 0x19DDA 16092 bytes