Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6fad70ea3a36899…

MALICIOUS

PDF

93.2 KB Created: 2021-07-06 01:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2c3368466aca5e3d72f130f4ed61450a SHA-1: cb371bab81253ccf54296d6a260f66208cf2845a SHA-256: a6fad70ea3a368993a87e4c30989ee22952af6198b7d67f8f5336bb96e4483f5
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844ce728b5a---5979063644.pdf
    • http://studiogallerani.it/userfiles/files/valavazenetuw.pdf
    • http://apsencollege.org/test/fckeditor/file/fokatituwuxoloduf.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/4ab1521f9fd910492cec68822e04de08/20778518060.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a28ba7a138---4276130526.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/0984f7e4321f228ae0970afe2b7cd5b8/maxorepib.pdf
    • http://asfalon.com/__files/file/86619956658.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/te2o0lctjia72c6kje51qu6oeq/20428658454.pdf
    • http://chromatographvials.com/d/files/90629657853.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec06342a5a---fomalupamuxaz.pdf
    • http://i-harmonics.com/upload/files/junedimaf.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa82795c90---30178748014.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/911f5c407748865e5b78c88873ac546b/pifogavezesozebozote.pdf
    • http://adance0112.com/upfile/editor/file/zagufediwo.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160845dd17996d---64994517.pdf
    • http://crackershrimp.com/file_media/file_image/file/suvaxuvajupokewinomijiz.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbe4ae62a9---rudobudepivu.pdf
    • https://metal-et-verre.ch/ckfinder/userfiles/files/xekenonufadidope.pdf
    • http://czdashan.cn/uploadfile/file/2021050719444873499.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b888a0db76d---rojurulopumugitenudena.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083aa6b77924---tezulozazuxudodolijanox.pdf
    • https://nestaerospace.com/uploads/file/8827836759.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607d13f4ef606---negof.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=construction+methodology+for+road+work
    • 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_off0001065e.bin
ba9dfc4b1bd2266a684cfd3503d2bb55daa27574c9cf397dc00ffda8e7df2aaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1065E 11348 bytes
font_01_sfnt_off000120c9.bin
48786662eaf956daaa0ead52ae731a90d5c38ca29583af337f07975175a69313
pdf-font-stream PDF embedded font (sfnt) at offset 0x120C9 17928 bytes
font_02_sfnt_off00014f8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F8B 16792 bytes