Malicious PDF — malware analysis report

Static analysis result for SHA-256 50777970e889b7b8…

MALICIOUS

PDF

73.5 KB Created: 2021-08-15 13:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 583dc2c8f2fe4c8e0ad17e3e117e3056 SHA-1: f1c001aacc670152ff9d6ec5653bfd315e416eaa SHA-256: 50777970e889b7b854889e7698adad4045a8d85862f88aa6a417f0a9bf9356c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised websites, including WordPress installations and disposable domains, which are likely used to host phishing content or distribute further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were directly extracted, the PDF structure and embedded links suggest a malicious document designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=hojas+de+trabajo+de+multiplicacion+y+division+de+fracciones PDF link annotation
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/abc8ef580mgat5ab91s9v3ti45/765111294.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/pudosetevero.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/4eabe6f8dc88cf5acbbc7ef810f1ff9f/42182620724.pdfIn PDF document text
    • http://dejede.com/userfiles/file/84507244750.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/resoratezadevedul.pdfIn PDF document text
    • https://labelmarket.pl/data/file/26865946965.pdfIn PDF document text
    • http://mega.kz/media/upload/files/53386035045.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/g2d8hfb160mbhg8dkb12sui41h/28832939900.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/v545hkuk2hggt8ptiiog0ov3t0/59718610878.pdfIn PDF document text
    • http://flyingcarpetclementines.com/userfiles/files/ripanigokoselut.pdfIn PDF document text
    • https://angkalaris.com/contents//files/zumarowa.pdfIn PDF document text
    • http://www.moyekolodin.com/files/75957504002.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/89714668834.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/8534457368.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/62982c0517c9c024a538c09ef5281813/77763311535.pdfIn PDF document text
    • http://cichanski.com/Upload/file/pinipofiwuta.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/91150706632.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/vazokixalu.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/82tg09vsopv7s0m6thmj46lb06/78477431826.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a1bdd64dfff599f799ed7121eb5cd469/zasaropedoxotokolokijili.pdfIn PDF document text
    • http://skomi.ru/img/files/file/15877484243.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/68a38c97abae591bd799bd6e3295bcc0/kabepowubezuguraru.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/fiziki.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_off0000baa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA4 11324 bytes
SHA-256: e447cb7336b839cfd6b3cb2c105c8a1943dc26f11a0a46cf9ba24f84fd357427
font_01_sfnt_off0000d502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD502 17040 bytes
SHA-256: a0568c3918105f3805b5326b9e7bb81d1ba2735e06a2f089e6c065e061a21fab
font_02_sfnt_off00010004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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