Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bfcf5e5381a027…

MALICIOUS

PDF

68.5 KB Created: 2021-09-27 08:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67417067ea13e7d672d05ed0047cf592 SHA-1: 8190e7ea26de0e9aaf22bbd776e53c0c544720d1 SHA-256: c7bfcf5e5381a0272c253954e3afb8ec14b5f6b576970611715406bf46a06240
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://crewmak.ru/uplcv?utm_term=upgrad+mod+apk PDF link annotation
    • http://travelshops.pl/userfiles/file/jivotudowefawel.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/zajeji.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161432aa4cbbc2---wosifage.pdfIn PDF document text
    • https://ekransamara.ru/files/41567515930.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/38066359649.pdfIn PDF document text
    • https://plasy.com/uploads/file/fabizulafoburepo.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210914121555.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/letobobetolatur.pdfIn PDF document text
    • http://wych123.com/upload/files/lowaxesufadosopo.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e14d1cdc9---lizomubakaruzeji.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/27395659378.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f41b98416d---gutebixokejofenatojili.pdfIn PDF document text
    • http://nprofit.hk/userfiles/ditelixazatup.pdfIn PDF document text
    • http://leasingtowers.com/ckfinder/userfiles/files/mekofixif.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/mumoxowesebufasofola.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/44233172852.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/98123791337.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/41325967230.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/55360879204.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/jifirovipomemixeloj.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109070755466255.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/5093379773.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1e3e03d92---difetokorexopidelig.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/32659021075.pdfIn PDF document text
    • https://gemicilojistik.com/userfiles/upload/file/32677671962.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/kl6eiqju4mdsg0usfcs877a3e5/pakivobogedexiviminogev.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_off0000b0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FB 10192 bytes
SHA-256: 1cce43cd05dd9f8505592531091f0f2743155f1b7a58f6b4cafe47c2a9c0b7d1
font_01_sfnt_off0000c790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC790 14552 bytes
SHA-256: 6d21b13e924b50673ff2ecf0f1cda47ceb69456bfdc72620f5580851476bb06b
font_02_sfnt_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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