Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae8d907f287831f…

MALICIOUS

PDF

86.9 KB Created: 2021-06-27 01:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a31cfa0e493600fb4f591a39934b87d SHA-1: 1d3f70a9c4a7456291a3307721d5075df1156488 SHA-256: 8ae8d907f287831ff38b0bf225db5020fbfd3f67c533e7710bd4b4ebbccd0386
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to phishing pages or download further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://angkorphotographyguide.com/userfiles/file/97986423979.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a18a683c337---26381415922.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ra7bbamrq7h3v1u4cghdvftuid/puriwavuvomiti.pdf
    • http://uniquecharacters.com/upload/files/75934310544.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/78kilqo0r911dnifn4u04s35lv/48105698388.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/4bdc051da332b85f096d99186c46a78e/63069870803.pdf
    • http://asbu.net/uploads/FCK_files/file/26639132279.pdf
    • https://bandai-k.com/userfiles/file/lixubapakifidaretitopo.pdf
    • http://to-kajihan.net/js/upload/files/sopojefugetaronezu.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/nttpchrha3e3l6dji47vgtjhe3/wujitup.pdf
    • http://j-club.eu/userfiles/file/kavesareved.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/4388781cfdd80819f441cc07cf0ea76d/71735648067.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a791e6469d7---lijimaranavetifu.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b33d871a1e0---wukeno.pdf
    • https://pezenasenchantee.fr/userfiles/file/pikapekowinewus.pdf
    • http://bertrandetgastineaudesigners.com/userfiles/file/82235718919.pdf
    • http://kondicionery-fryazino.ru/upload_picture/file/5002647650.pdf
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/kajarotugarusemojulamobix.pdf
    • https://oncallanatomist.org/ckfinder/userfiles/files/tevololo.pdf
    • http://jhferry.com/data/fckeditor/file///jeminuba.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=us+currency+to+rand
    • 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_off0000f427.bin
dbec933d30641ad27b730e4cd8221aa087fe5b48abc6a3cfe58174861c807e2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF427 16516 bytes
font_01_sfnt_off00011f05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F05 16792 bytes
font_02_sfnt_off0001371c.bin
d083e0436f75df3d7b66a383f8e04b7d8c080c4aa1a893a93c78173efcc82a0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1371C 10448 bytes