Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a61dd3ad603360…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 13:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 94d707da334065b3afbb1d011bc2820f SHA-1: fff53619ce751471befdf87a93b03a65bed59da6 SHA-256: 91a61dd3ad603360b49abd9e0e263464b0f6cf535207131ea061997d1b63ba2b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The embedded JavaScript is likely used to facilitate these redirects or further obfuscate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://myphi.biz/nbloom/fckuploads/file/88542178713.pdf In PDF document text
    • http://joltiy.ru/uploads/files/88366616919.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/zixixuposobomokejakor.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef3cb83da8---61804527512.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/4d51526eeb55c563cc126d850e12745f/simonekulagag.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/kosawutawovabowuw.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/81465989407.pdfIn PDF document text
    • https://people11people.com/uploads/File/topozopilamelanaxegonolub.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/gudilazidideduwibuwebif.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/cd84a52125e3a401fdbf4ffa186c4ae4/2525448874.pdfIn PDF document text
    • http://epicridesnepal.com/files/kosugipumutefuveni.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613469209031e---20724170752.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/bezexafipo.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__61421CFFA1B7A.pdfIn PDF document text
    • http://royalgroup.at/tmp/38177533987.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422c69a8e4e---wosefonofokusisusokisege.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/lusopur.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/sazogaxupen.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/vezopemijagisaxovarivo.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/zokalefokusus.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/78085431793.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/xiwololokon.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/58029001153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=top+war+hack+codesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A6 10412 bytes
SHA-256: becbba66c9b911c3d5a4b60e91f4f546767339fb1016b776db51bacd06155946
font_02_sfnt_off00010978.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10978 18112 bytes
SHA-256: a08d01e3e905dbbc60dbabf72b86a488b15df8f87385c06ba864fb1326237a8b

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