Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b370e2c4994efc…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 08:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c61d95b1bbf34592ec0b6fe75543ded4 SHA-1: 63b74fad548714570107be2ff5f1b54543873171 SHA-256: f1b370e2c4994efc51418f9aa0ac2b9bb88d64c915dce653f859fda57c350cc2
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it is a link farm and a lure for recovery secrets, suggesting a phishing attempt. While no scripts were directly extracted, the PDF structure and embedded URLs point towards malicious intent, likely to harvest credentials or sensitive information. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://laborke.ru/uplcv?utm_term=hero+kannada+movie+online+2021 PDF link annotation
    • http://sprinter-lab.ru/content/File/mikebololekixuri.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/wikebajomomatipisiv.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/54d5ebf05abbafca6c752674b6b31a8c/newidaf.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/413babd36644caf9b0b3973d9331f28b/sebubipafe.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/fukazun.pdfIn PDF document text
    • http://newcityhk.com/userfiles/xuzugibemidep.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/wigasotofuga.pdfIn PDF document text
    • http://taigesw.com/upload/files/pamuronubakujakuxas.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210902071900.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/gezejigesadabe.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/murivabibixovadiximaka.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/62277682383.pdfIn PDF document text
    • https://unosms.us/userfiles/file/lomodonisufilu.pdfIn PDF document text
    • https://digireg.gr/upload/84145995215.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/turotasadozilemi.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d134fe4b0c---75384912321.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/sejowofamesokotukef.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/89705451144.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/nixinotabuzoviwoleronavov.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613efdd7853f8---84694793276.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/tosox.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/dipimavoka.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/47922624087.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/80778976258.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/pareva.pdfIn PDF document text
    • http://mamitobe.ru/files/file/zomusemafomarewamaj.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_off0000b4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FD 10584 bytes
SHA-256: 2d2192c8a89194144915101748e825d6cd5be1b2690db9fcc608f66dc448ce77
font_01_sfnt_off0000cd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD1B 16880 bytes
SHA-256: 7a69c96680ad03c7a1c1bb6526c5d55da32e33d80b8f3a6ca8eb4da07ceba53c
font_02_sfnt_off0000f78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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