Malicious PDF — malware analysis report

Static analysis result for SHA-256 6554dc064e73c8d8…

MALICIOUS

PDF

79.9 KB Created: 2021-09-03 09:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b90b491aeb78216a0a966783016a4f59 SHA-1: caa28d2cc079a3f0cbebe0fe726ac56ea4b39553 SHA-256: 6554dc064e73c8d846bc59dc8c1f94726869841b4a8a74ee8e1a61e8a683bb7b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://cokhihoangvinh.com/uploads/userfiles/file/buxoga.pdf In PDF document text
    • http://architettotamborra.eu/userfiles/files/49957116196.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073a66c06197---39679329281.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/pimejumuwoza.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7e533a9f8---sigedulemojivu.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e56d4ed0a---93119472602.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210825172720.pdfIn PDF document text
    • http://nktrading.qa/file/files/98363944760.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/fopezej.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d62de363b---15751936929.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/27209954486.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c54f61d7a67---zivosipef.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/modugidetumefev.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/ruvopudupe.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/11014499768.pdfIn PDF document text
    • http://olivia-mitzvah-2020.com/clients/b/ba/ba4af741f15bd7b6832e7848668b55b8/File/67393034789.pdfIn PDF document text
    • http://landpas.pl/upload/file/nanawegiwipoxikus.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/90576089186.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/wedubifamakuz.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/18691960488.pdfIn PDF document text
    • https://actorconseil.com/files/file/kipumo.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31ca52e16f---jikujajovepek.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce9ec301c4---nulenowoten.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/25117283976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=heuristics+encrypted+pdf+virusPDF link annotation
    • 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_off0000d216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD216 18356 bytes
SHA-256: af75631e9c71e3272e475a527fa60423a49e03ede1182b2201918eb5a9296709
font_01_sfnt_off0001016a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016A 10556 bytes
SHA-256: f628da6788255fbb4c80c0a47a062d743b357f68a152570c18f941ccea963be7
font_02_sfnt_off000119a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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