Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6254da7163229b7…

MALICIOUS

PDF

86.6 KB Created: 2021-06-25 12:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3e7ecf7919d90f8da93b55858f5432d SHA-1: b22de41c8cc91ee2f4ec9f4ae6ddd2b78abf9027 SHA-256: f6254da7163229b73e39c19e5a6f18e197ba9e734092ace5c0d110237b362088
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://sp3siemianowice.pl/userFiles/files/28364038064.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607125836ff3e---16787736462.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c92075101dfc5a2db73f3e9bea55acfc/lamonamulofuvezekulotiwod.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/1c6ab5d7ed40b59d8ce609fba7d1121a/zasilavurabewivajixitezug.pdf
    • https://pasarantogel2.com/contents//files/64498703534.pdf
    • https://chpcentre.com/files/file/kegosemoboruji.pdf
    • http://sashtraayurveda.com/ckfinder/userfiles/files/37620770989.pdf
    • http://arch-teh.com/pic/userfile/tosizamujeg.pdf
    • https://bojovicsirogojno.com//files/nawurusawepuwipuvedi.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6a605e5cf---lefegigezosipujamiforel.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/308303d97829b97e45be0df3f127ad17/fusivige.pdf
    • https://capitalsyndic.com/userfiles/file/kajew.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5d6e73e9a---16102732293.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ek4i6veh91nqv9q0sl4et4met4/86806650351.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607eea3401f0c---33111686451.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/1j335cc87ike47f7rmh9qksgfi/wanofo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=hasta+mudra+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_off0000f427.bin
f54530763708db5e064048eccecfd38a0fe41d9105acd285e52aee8b8338d5d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF427 10256 bytes
font_01_sfnt_off00010b26.bin
8f770270e95701f850cb76c970d414534e4608d48f400d4ef853ed73bfcda38d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B26 16584 bytes
font_02_sfnt_off00013609.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13609 16792 bytes

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