Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc542eda80b82a25…

MALICIOUS

PDF

74.2 KB Created: 2021-09-09 16:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1a2143032275d61896ad1fd6e71b86f SHA-1: 63b0fcf2f40ccf553acd2ceec8cc73f1dad21348 SHA-256: fc542eda80b82a25e565b29d3b533140be8af75b17fd07a3cae6b67cc584015f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. The presence of external URI and link farm heuristics strongly suggests a phishing or malware distribution scheme, likely delivered as a spearphishing attachment.

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://crewmak.ru/uplcv?utm_term=fluid+mechanics+book+by+sk+som
    • https://j26clean.com/upload/files/sorutanenete.pdf
    • http://hangquangauto.com/files/41027262004.pdf
    • http://studiopedrazzini.eu/userfiles/files/57592007848.pdf
    • http://theflowermaker.com/uploads/File/dudidagedagovavafitonuv.pdf
    • https://sarvodayasamaj.uk/upload/files/93866477754.pdf
    • http://iamsong.vn/uploads/files/simaxebuvonog.pdf
    • http://denki-shonan.com/uploadsfile/zedixelomizejaxowij.pdf
    • http://acm-medicali.it/userfiles/files/57744822343.pdf
    • http://intelekt.biz/uploads/pages/files/minakanizazaj.pdf
    • https://sambelteri.com/contents/files/nedanodotapafuwid.pdf
    • http://stellamaris.cz/userfiles/14248505564.pdf
    • http://andlupa.com/userfiles/file/faxumo.pdf
    • http://yejida.com/userfiles/file/60612573163.pdf
    • http://modaxch.com/userfiles/files/97920087951.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a9f1c4b1e---58461420693.pdf
    • http://pension-erlkoenig.de/img/editor/file/50874872662.pdf
    • https://robertbah.si/files/file/70591066563.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161351f7688843---foxafotapijikededifi.pdf
    • https://arch.ua/ckfinder/userfiles/files/tifobagamamedotajivovopes.pdf
    • https://viceda.com/userfiles/file/48474171341.pdf
    • http://ebbers-schilderwerken.nl/uploads/files/52911399232.pdf
    • http://kdekdyjak.cz/data/pagamanatagopabefixepi.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131f50f01145---wixudevumajukozazibeponi.pdf
    • http://lamelove-zakryti.cz/userfiles/file/29932429729.pdf
    • 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_off0000bdd5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD5 16792 bytes
font_01_sfnt_off0000d5e7.bin
c4cb3572b5062769024129a8d7ab7acbbb34d6f608614e8b0c6044958fe0bbe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E7 16988 bytes
font_02_sfnt_off00010265.bin
d920f3a6508212e0eb5e724f3d7ab5184df1b3d9127d49fc097c1b08a7bf2f1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 10860 bytes

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