Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9f464212f4cdb7…

MALICIOUS

PDF

81.8 KB Created: 2021-08-06 11:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41c5b7beb830518afbfd514c7e1880c5 SHA-1: 61d101235e475c464305a41008bb9113efe58e8e SHA-256: ae9f464212f4cdb7c5894ee3f113168c048fa7089fe2f7828923706d6e972649
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to initiate malicious actions or redirect users. The presence of multiple links pointing to various domains, some of which are identified as link farms on disposable hosting or compromised CMS uploads, strongly indicates a phishing or malicious redirection scheme. ClamAV and ML classifiers also flagged this file as malicious, supporting the assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://crisismobile.com/ckfinder/userfiles/files/84458542194.pdf
    • http://www.de.ruben.pl/ckfinder/userfiles/files/fafefixugata.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cdcbf03f4c---69951024272.pdf
    • https://sofupingame.com/calisma2/files/uploads/90659209124.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071a84a1240a---bojajezidozoluvepufa.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ad9rljrf1vk6ndas89vhfana04/2363337938.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f3324f48---bezujadoxa.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68ad03beae---bopujadorinigonolupel.pdf
    • https://imahima.xyz/js/ckfinder/userfiles/files/85247051994.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa80db674fc---90246260612.pdf
    • https://alianzatours.com/imagenes/file/xarunesebekodudelasakixur.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/37jroblumebivh3bjd15ovm0m1/70613395158.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac486457fe8---didodedisolopuzukix.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608fab5bc843a---xubogokitatadidexakix.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/049fd870890b18b77eaf7bcd21523164/mexiwawazolobivezufumazi.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f8a011741---vebifiwotafudenifulukeseb.pdf
    • http://majorpropertygroup.com/userfiles/files/13124947101.pdf
    • http://aaaexpressac.com/userfiles/file/96020288928.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/8f83d2cb165302cc9b3df8986d0787c6/katugadepitiwizigakudisu.pdf
    • https://castilloexterior.net/ckfinder/userfiles/files/20989558845.pdf
    • https://ludifrance.fr/userfiles/file/96439958863.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=a+court+of+mist+and+fury+series
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c949.bin
b76a86e006d8f0b4393a03c59290b34bf0f514c7c833a5d32ec9287fa6320af8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC949 15984 bytes
font_01_sfnt_off0000f284.bin
24fbb6860a375d696e5459616bebdc6067824577f789e88451ba639f03010f8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF284 10784 bytes
font_02_sfnt_off00010b71.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B71 16164 bytes
font_03_sfnt_off000120e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120E7 16792 bytes