Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa4abbc26c430e7…

MALICIOUS

PDF

76.1 KB Created: 2021-09-07 00:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: ff6a65b513c044be01ed386147e3e528 SHA-1: b50b4889ab5cba17936d6c39431e7fd962a3c445 SHA-256: 3fa4abbc26c430e7af841f45a3159008d9bc37addb007ffdca749c50ea954c63
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload directories and other disposable hosting sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=sage+barista+coffee+machine+manual PDF link annotation
    • http://hopsch.de/uploads/file/sidawejigixura.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e76cd7d410---sotade.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/8770263c1abbbd81c279d89f289ac752/kagufokewesevawutolej.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608541624272b---72771144473.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608062dd13539---34850538534.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161248584d9623---kodotuko.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/1938884729.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/jorogunofapepexi.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5637e0e407---lusezoduxibififat.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/41451260740.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/zomuvidig.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///kevulozafununowenev.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607016792d9b1---56741924650.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/pomir.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1611b4b4bb6835---87008742255.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/karafakisoxegurezekomo.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/32551750735.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/46672452638.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/8204414958.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/20igh946kr126qf4jicenurjp5/92812261056.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/47823554302.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4972a0148a---fabirifo.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d3bde35a---72746861023.pdfIn PDF document text
    • http://stromzeleny.cz/file/dulotekuz.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_off0000c399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB0 11096 bytes
SHA-256: 88d215665a06eef7bbf8d8b8e16363e989fd601728d69c83092851423a4450d4
font_02_sfnt_off0000f554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF554 17612 bytes
SHA-256: be7bf94d8b49a3d95ed96c49bdd0d143077d9e6ac1a5db4ddb8ec32d55e2fa65

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