Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ecea0a9971a4b8…

MALICIOUS

PDF

79.7 KB Created: 2021-06-19 13:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77250564b9135007f4d4fd2a719553ac SHA-1: 284d0905a21387af653cb693f32a9aaef31f758f SHA-256: 35ecea0a9971a4b82533a9f941a7748914ae90f00c2551970c4c13df4f48fdcd
164 Risk Score

Malware Insights

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

This PDF document contains a link farm hosted on multiple compromised WordPress sites, suggesting an attempt to lure users into downloading malicious files. The presence of a 'download' button heuristic further supports this. Although no scripts were extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14772b4c5d---vijevataluwuw.pdf
    • http://copy2d.com/ftp/image/file/39679674143.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/0a4525f916066582f34392173eacfd38/siviwajobelafokigovat.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b1855f7126fa360a27df731922d0d8ff/wudenigexez.pdf
    • http://geyikkimya.com/userfiles/upload/file/89576017922.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075383e93e17---puzinuwixojela.pdf
    • http://contactconfiance.com/files/files/rutokexemasoni.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b478ba8734f1748b3f10933e87d505f5/42487114542.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/41236cbf0ad2b165fbb8d1f0ca54f763/55431088087.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/74a58944116bdd1138418350fa921b31/wajulipisarigunu.pdf
    • http://kibbkw.com/uploads/file/jexifomutexopol.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/645e9bcdf98305d72755640e4b097aac/furojufozoruxomeku.pdf
    • http://amadpich.com/userfiles/file/72060857794.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc8e885ef4---5437206028.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/ee24d55e2983c59c4b20431ce6ae5cec/xopuletixenajuxewafufire.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/lib7jbq2pt8da6edg1cld865p2/22234717780.pdf
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/90598431322.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/6dc707200f7035e073fc2243036fa455/84214090275.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e921e176e---5990250540.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=chennai+express+full+movie+480p+download
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9be.bin
b191ba065d019e4479d7f6da92512f3b86d39c92c34380580a31a07fd4f2b9e0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 5748 bytes
font_01_sfnt_off0000fd2d.bin
315e3d1b309f89d67d3e3ce0a1690e041838649cf447c798f88f9fe15bbe3f1c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2D 11280 bytes
font_02_sfnt_off00012340.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12340 4324 bytes