Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5739a497979a9c…

MALICIOUS

PDF

89.3 KB Created: 2021-06-27 22:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3ee67972fd86e87edb35f785b829b85b SHA-1: cf8e90a168308b8c69a5e908584e9167be9a21ee SHA-256: 3f5739a497979a9c500cfb5681033626e86ba59b4ea16b48fec481e6317d8f27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://synerhu.ru/uplcv?utm_term=i+guess+why+they+call+it+the+blues+elton+john PDF link annotation
    • http://musorcentrum.hu/files/article/file/puwaxupurilenenikorijije.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/51430c59ea68c9f702ef52242f546f37/gesituxotoxomuxe.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/fajowozided.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/tuvuropa.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609125183963a---sekuxudus.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b05ecd054e5---reluxesisurivuf.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607081f686ecd---tumovimo.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/48555829107.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28c6ddedd2---wixuzadoxosodopijeg.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/bevalimadupu.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/gjib1gmkek041i7k3i9077mdal/13725607633.pdfIn PDF document text
    • https://motacademy.it/file/80393723932.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/57990381611.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/82l8o5vevve216p0p361nuq476/42582944529.pdfIn PDF document text
    • https://littlelightnepal.org/userfiles/file/dotepapefavujedobixen.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210625200026_7cfuia.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/6ain1q4en8p9kh6lo3esrgqslm/rewufupa.pdfIn PDF document text
    • https://teyadegitimvideo.com/calisma2/files/uploads/musanaxudo.pdfIn PDF document text
    • http://mesterek.net/tmp/jefuviwowudu.pdfIn PDF document text
    • https://troypin.com/calisma2/files/uploads/rinuje.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/jazabanizizafukalogeji.pdfIn PDF document text
    • http://meta-min.com/files/16869256242.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/xofenupilo.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tkuo5snl1he9eb2ep28eqr1i91/jutixexigotefemekegidi.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c309cd1fad8---jitawa.pdfIn PDF document text
    • https://actor-conseil.com/files/file/24637117464.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7B 22904 bytes
SHA-256: d6d0cf59d9af84ddac8b3499afd5915417ff90ba448b8e90da75a5bc7df188ca
font_01_sfnt_off00012406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12406 10928 bytes
SHA-256: 0ff239dad68ddc58b0d47c3030ba430e52e9c242427aa4658f2f539a928af65c
font_02_sfnt_off00013d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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