Malicious PDF — malware analysis report

Static analysis result for SHA-256 f767f30a4da5cdd3…

MALICIOUS

PDF

69.6 KB Created: 2021-10-03 03:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5558adfaec6d84d2e190f4e760bfc805 SHA-1: eb51aa950f76b3a11d5837e3e177f6b3d54d389e SHA-256: f767f30a4da5cdd3574e3b0364fc2214a58422175f601e457a70dbf6c9ccdbc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to obscure the true destination. While no scripts were directly extracted, the nature of the URLs and the detection as a trojan indicate a likely intent to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://unibel.pl/pliki/upload/file/54280158037.pdf
    • http://maekuangudomthara.com/ckfinder/userfiles/files/73290049656.pdf
    • https://terracetemayonetim.com/upload/ckfinder/files/ferige.pdf
    • https://dcimx.com/files/visivuxuduxifojenefoxe.pdf
    • https://uzunlarpeynir.com/dursun/upload/files/65421327327.pdf
    • http://okudshava.ru/userfiles/file/99515138945.pdf
    • http://www.findvoters.com/userfiles/file/18242460146.pdf
    • https://osakaav.com/userfiles/files/56882884174.pdf
    • https://ourcampuswindow.com/ckfinder/userfiles/files/xokubanubasubuxazig.pdf
    • https://nilsahost.com/calisma2/files/uploads/vuwuxitupepupa.pdf
    • https://doan295doson.vn/namthuan/images/news/files/wekerejaxalijisepiv.pdf
    • http://studioprogettoarchitettura.eu/userfiles/files/lurapafafezupopolusepale.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137c0bd9024a---xidusan.pdf
    • http://se-ty.com/uploads/userfiles/file/69897946421.pdf
    • http://edv-denk.com/userfiles/file/15474931630.pdf
    • https://fishuntpesca.it/file/rugigijajan.pdf
    • https://fanaf.org/article_ressources/file/lisegadoxesejivixuzu.pdf
    • http://christschoolblr.in/userfiles/file/85918346882.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/161417f86f418b---71924603781.pdf
    • http://naturabliskociebie.pl/userfiles/file/jakegomutebetusiwalolinap.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/5291c0dd94f31e7e0e7be43095a34d5f/dotuperotofuwajoxozat.pdf
    • http://muntepa.com/userfiles/files/vilapojakuze.pdf
    • https://legyenegyjonapod.hu/userfiles/files/sonixuzaxolomazekojixu.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/rh9f7isu103k00r0oeb9gk1tm4/59799759302.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+scan+a+pdf+file+and+edit+it
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b017.bin
31f804b7d10fab814706f056f6000b966b5fd7df859e712bd2f27021c996eab3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB017 10592 bytes
font_01_sfnt_off0000c86e.bin
15bf03748adf05263364b7abff14e1cc342350b97952b9c586ccc821b8c1b95e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC86E 15976 bytes
font_02_sfnt_off0000f0fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FD 16792 bytes