Malicious PDF — malware analysis report

Static analysis result for SHA-256 747a3e36b4247eea…

MALICIOUS

PDF

82.7 KB Created: 2021-10-04 23:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c40e5627715314f18eb2230e1d50d7eb SHA-1: 70bd4089bdf0c43a9437783d05d7f008fda8217a SHA-256: 747a3e36b4247eeaa88ce3b881e691726e5f6b1f8282e6d704a01ff6a4bb8d8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier flagging strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URI heuristics and link farm indicators reinforces the conclusion that this document is part of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7472

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=how+to+delete+photos+from+instagram+chat PDF link annotation
    • http://gediklimakinahidrolik.com/resimler/files/wufinatunexevedibinin.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/domofupod.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/58882952250.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f5ce9a21dded5942b1ff3bf66343f66a/kizusuzunadonujadanumodif.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/wapuvonazeduxin.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/venikuzusawi.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/mevogifone.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/60218901662.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/baziseje.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/nobarewelusoxegatob.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/92845217160.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/verasef.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/97888449752.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/12592185788.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/80734686924.pdfIn PDF document text
    • https://value.ae/userfiles/file/43225877848.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/94478254920.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/4362319372.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/b3077e74ca612e3e81428dfb289f1b12/9341095713.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/jolikolefav.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/pgb4qjv3lo6b6rj3lfs7smnoo2/81744105946.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/5c9d5f32cb863dc3be09469c8d85ffd8/18048472938.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/95791604476.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/zemizinaji.pdfIn 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_off0000e569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE569 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7B 18320 bytes
SHA-256: 1ea6fdc01f8c858bc7ec3d4175c3cc7a4d1006cc27c26aefd9d94d939d8a4091
font_02_sfnt_off00012c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1D 11144 bytes
SHA-256: ec618b7d7c51dfd758530b49e5f5a3b607c3f16b6cd7f8fec28b5bc2c6ca2fb1