Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2ad0fb7e7d2454…

MALICIOUS

PDF

85.1 KB Created: 2021-06-29 07:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 746810ad1e6814802d493bf9dbd8cde9 SHA-1: c633dc5c5127d47357db7e3da411767a4c8799f3 SHA-256: 5a2ad0fb7e7d2454a464e8268627f885c50aec7a03d0a17eef7fa5e2e33e501e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a large number of links, many pointing to compromised WordPress sites and disposable domains, suggesting it's designed to lure users to malicious content. No scripts were extracted, but the link farm structure is a common tactic for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=mrna+sequence+code+for+amino+acids PDF link annotation
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/q4rrjqske0as0tv0uhfd0ivhgn/jelopigez.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a9c7e0ab5---kivekojirijiletaje.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/50650931350.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/72175369962.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070c87888858---25523809732.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160936a1cb45be---63444288721.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/14106592181.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/7n10a7e0pmt4b005003dgpjrh6/manugedu.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b53c1e4f196---wuxizesogilamupesaxa.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf54fe11338---44151974501.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ceaeae54cffab9c48f3b2fca40e32275/kefuxajuwujupatolekevopa.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/wobutiviwedoxiwotejaz.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/hathehnjlhqhq2or3ti97udbeb/duzivusekevuripuzawafar.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/wiramumofulererifexigaw.pdfIn PDF document text
    • https://giasutainha24h.com/upload/files/telulaxumederewije.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/gulotuzuvomor.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/mv042kuihe8ufc1mi2se2kndq6/65637669812.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/bapedimogig.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d7ac602cd---bonijakidevuzorog.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/574e2e18336baf52eed8bf1e445047e3/16559974303.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/dofiveresaxezujetovaba.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_off0000e7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D4 17220 bytes
SHA-256: c6bbf5b68580b66488a7802da7ba1a6df281321a267496dd7c5bdc667e30077f
font_01_sfnt_off00011502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11502 10732 bytes
SHA-256: 2bf622da017d0ba9fd17524add196286c89b4e5621542e2c3833d59c2df0d88b
font_02_sfnt_off00012d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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