Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c9c5f1f5ba8c6e…

MALICIOUS

PDF

71.7 KB Created: 2021-09-09 21:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c1e7cc5359a870bdebac69dc0d0b9e5 SHA-1: dc17ab50e6d642177b7352c463e36eb9fcd8890c SHA-256: d6c9c5f1f5ba8c6e42239437e90982072c332a7b048b0b4470b830771db8bea4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs pointing to various domains, many of which are identified as link farms on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=android+system+tray+icons
    • http://2990592.ru/ckfinder/userfiles/files/maxuvekawebolagi.pdf
    • http://covina.crazyrockinsushi.com/uploads/files/64491175345.pdf
    • https://inprovitmexico.com/ckfinder/userfiles/files/ravejotugisupewozunoruji.pdf
    • https://cs168.tw/upfiles/editor/files/kovesesuwofod.pdf
    • https://shinaltd.ru/images/file/26922593404.pdf
    • http://world-housing.jp/ckfinder/userfiles/files/bedenodad.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/c87bc7d4fe0f032fe1e304628409bf2a/zeretewoguto.pdf
    • http://mrtowing.ca/Lawyers/userfiles/file/tozirufoginevokanu.pdf
    • https://tefen67.com/userfiles/files/zuxoxepeviborol.pdf
    • http://vhktn.at/images/content/files/bujiregedofevaxi.pdf
    • https://feldmann.pl/userfiles/file/jojevawerogisomi.pdf
    • https://carlojans.com/cms/file/68050485640.pdf
    • http://iscelenie.info/files/file/5038328943.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389f1b841bc---zuziw.pdf
    • http://mikomisushiwc.com/uploads/files/4575559894.pdf
    • http://canissapiens.com/images/uploads/file/75690965551.pdf
    • http://himalayakebab.com/shipinc/userfiles/files/18688734600.pdf
    • https://ensegun2.com/ckfinder/userfiles/files/bovatirobelenukalukapez.pdf
    • http://druckmaschinenservice.com/uploads/fce/files/tiputakezeze.pdf
    • http://benthanhsgfarm.com/images/uploads/files/sifozatabalukig.pdf
    • http://itcbeautytrainingschool.com/userfiles/file/7923989429.pdf
    • https://parlagame.net/calisma2/files/uploads/66637784753.pdf
    • https://norservis.info/files/files/jobezafixogow.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137ba3c8e889---xagejalabetiwivi.pdf
    • http://korea-labels.com/ckfinder/userfiles/files/fopojavaforozepobageripiv.pdf
    • 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_off0000baad.bin
f44f689bab034f7a936acdf11bec7c84eb1eb7d2754c04c0d923c6875c501e92
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAD 15300 bytes
font_01_sfnt_off0000e17a.bin
e7fb20355dab13b35c9699e0f8f9fc0c3587d6489a81b01b839227a66ac8d57a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE17A 10580 bytes
font_02_sfnt_off0000f9ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AE 16792 bytes