Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d8a3a783bd95bd5…

MALICIOUS

PDF

74.9 KB Created: 2021-09-18 22:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 988157d8817bc2039e94526f0d21de03 SHA-1: b953136b660d06867eb87b1abe5da17b2161ee5b SHA-256: 0d8a3a783bd95bd51f026154207b11046b178d8acd106d1ec2c1aafe6946e21f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of distributing links through generated or low-reputation domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5832

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://nomylo.ru/uplcv?utm_term=bugjaeger+unlock+bootloader PDF link annotation
    • https://sluganarodu.org/userfiles/files/32455384729.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/watoditarenamovexetivawo.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/28610053989.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/50845759728.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/vumupanuwigijikobu.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/vulakekovima.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/7355330036.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143f9b536e76---50738930190.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/68075c5fd3a9b3f1b7f26a845dff2ee9/wizejebexixe.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/dodofusutafiw.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/98412992638.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/87655452735.pdfIn PDF document text
    • http://jonellchem.com/upload/files/gewodi.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/modulozer.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/61408568250.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/85036054796.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/96419801427.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/mekukivasifusosija.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/guwuzararewizu.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/togevuxepawamufog.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/3fe5a6abe58f9db74db047c03ee604da/87669711137.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161397097933c8---9839579356.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/fizimaberud.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613656152a981---maripivigugenevunipo.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 18196 bytes
SHA-256: 8f95215aaa21dbf536ed193612c1e05f28aa903f94e18fc16668208f43a69af8