Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa12f72443eacbc…

MALICIOUS

PDF

87.3 KB Created: 2021-07-02 18:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0f7b0d002be8e23edb786aade9e0b6e2 SHA-1: cc6d71c3d4b750327c4af3e6dc99a2a2167a7411 SHA-256: 2fa12f72443eacbc71b5d24780daff10757e42573f971e85f35e879575e129ea
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, acting as a link farm to distribute a malicious PDF. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links suggests a download or redirection to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=1.7+tons+to+pounds PDF link annotation
    • http://broadviewlibrary.org/uploaded_bvlib/file/kuwuxikemel.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/54767093738.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609884892a807---livajepevemefide.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/eoca0023h590nqi99gcn7134p3/dobele.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160824d6ba46cd---jazivulumupa.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/91356511509.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d1702ea97---nemufurixuge.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/28022c131b9fb9b23f578cbf93c3ed6e/livure.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fe10ae05---64165664224.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a6870a9ae23---mipadarilanexud.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2709fc84a775450e45e6bc9276ef996b/nopadulelezugowinoz.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/janugexevinimisukofar.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb43f0a861---71910716319.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160abb80866b5a---zabivojiwu.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/8erhbn95hg78sm343m5thb1mkp/gikisewesez.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/31388a7959ca4585787b28eaf38f37b6/lutaxelotakij.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/jozalemedeluxorimenikebe.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/58936505611.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f26109ad7---kegebisazewijo.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/18083601399.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073293e6f9bc---74553145204.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/32293285614.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/85965443178.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/748484bea1fc8e8a0442d213c6301c0e/73646693997.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833a63155b7---nirefikanedubime.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/a077f0a4642405282a8ce7ecfd5767f8/lifixukunos.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_off0000f5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A2 16832 bytes
SHA-256: 93bdf100b79ccfa54a1be00f4d658be0360733fe110f918c35ad606c59f78b45
font_01_sfnt_off00012164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12164 10024 bytes
SHA-256: b701e5b46237e1a5e142ab5e3058140abe7c8fc42e32b8ddf51f90ddb944595b
font_02_sfnt_off000137d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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