Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f395cd8ae0ceb3…

MALICIOUS

PDF

83.3 KB Created: 2021-09-22 19:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2d74673a6c529de355f9e0ddbecc22b3 SHA-1: ba4b20b539c2584299c1c1bbd63a3867af0af81b SHA-256: 91f395cd8ae0ceb3d82e3ac715a2797f609339b835b8dc650ca77be64499f9c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous URLs, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript points to potential exploitation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=granny+in+paradise+for+android+apk PDF link annotation
    • http://etkenkalip.com/files/74787492359.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/79370584430.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/jojawexi.pdfIn PDF document text
    • http://getwealthythisyear.com/ckfinder/userfiles/files/8771819381.pdfIn PDF document text
    • http://www.og2c.com/images/file/81164370200.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210910_185301.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613b58b50b112---nubufogarobolimizixuseju.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/ruxefifewuvegaxemakexi.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/miwajigumusesarufenidej.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/39682803555.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/48370241431.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613675ee7c97a---xonanupodemubevege.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/r7utv19su1ekbvmlhsjn41hh57/xerapesazo.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/29723247541.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/fibevijolapopodulejes.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/70625733194.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/seberosesuduzukamaki.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/fibamupizukatigew.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/97127862571.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/mutubajuwupesexisenivup.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/8675945984fa2b2d40ea372112ce948b/tonis.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/13634875556.pdfIn PDF document text
    • http://unsersohn.ch/images/file/28969293848.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/64583162659.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/1314606431.pdfIn PDF document text
    • 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_off0000dc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF480 10592 bytes
SHA-256: 4a3aca6bd8c29179257f310563736a860bc3529b398beee5851dbfa8ec424efb
font_02_sfnt_off00010cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD7 19168 bytes
SHA-256: 2c80cbe81231c215278625f428cbbefc4c4aa36b2f97952e23e6eb81ad06836e

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