Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcf8bc1e8529a255…

MALICIOUS

PDF

90.2 KB Created: 2021-09-11 18:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 50618c0786c82ce26603b10021e51e2f SHA-1: c9fa38dcb176f438b11918d390b09800e08b6e7c SHA-256: dcf8bc1e8529a25553ed635baf5195548910a666ada34270503922921e2379e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings suggest a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://minipit.com/data/files/duvulidujapugekovok.pdf In PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/54372045186.pdfIn PDF document text
    • http://dasbluemchen.com/52428170762.pdfIn PDF document text
    • https://scalping.ir/data/files/file/54690691049.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/63292735137.pdfIn PDF document text
    • https://majubesar.net/contents/files/32670041384.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/ranivekoduwafawibes.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395da2e49aa---bipexuzegej.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139482811328---jatoxur.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132659cd7f7e---91903204240.pdfIn PDF document text
    • https://swiz.eu/files/editor/25612082097.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/gigidowelofewajipofoxe.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0d95ebf89---kopimisutisabivutobe.pdfIn PDF document text
    • https://dintek.eu/uploads/file/noliwamuxipusagoburot.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/22778223367.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/vojanunaxametujamabesopo.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/rezewa.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/74346225315.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/fixaleziramomewu.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf38d303b5---lazijuteko.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/mumekaxorovebugumokodi.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52299934689.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130d332d5244---11703277878.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613293e7c0967---xeseponu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=apps+for+watching+english+moviesPDF 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_off0000faff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFF 18132 bytes
SHA-256: 9e8fe07d71a909ad7c183cdf175e2af5f8c52aa098731414f78a389556bca710
font_01_sfnt_off00012964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12964 11060 bytes
SHA-256: b140b1422454bc95bd0fae279531cbd2dc1766a1f010bf2cafdd80b639286979
font_02_sfnt_off0001431d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1431D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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