Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66a34b95c1b864c…

MALICIOUS

PDF

80.9 KB Created: 2021-09-02 13:24:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a0efa5145ab438ef56dce167cd212ffd SHA-1: f0b22eae106edaae473988200b1388ed320fa3aa SHA-256: b66a34b95c1b864c0062646cf05b95f0b0736054c769e4b4a779a2485113adc9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload directories, likely intended to host a password-protected archive as suggested by the 'SE_PASSWORD_ARCHIVE_LURE' heuristic. The document body is heavily obfuscated and unreadable, but the presence of multiple embedded URLs and the link farm structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/07c5f705ac8014145d96b0573fd33466/57998474971.pdf In PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/8d18f48d7061da2093bb2595ed65a2e2/58794412477.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/24362255685.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dff4e5c422---48107915900.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7c621112a---vuzosuwumuwebegukenal.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/zujojabumipiso.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/566213408.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/e8r9j6ona54p0lk9r7c6ece2j0/mezenopiletub.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/c72aj6k2cv5mph7o0cousgu9c2/romarilivupovu.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/c3c09b9d179c3b979a93e3c796539eda/2384855669.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0c06b6f71---77273910815.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/8c64e6c05bcd12738737a756d0a51627/68999562914.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16278002681376.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607559c426129---91736226630.pdfIn PDF document text
    • http://thehigh86.com/clients/13680/File/32740821003.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0b0b40f0f---50916090250.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-08-10/images/files/bosisaxowipaduwavikulo.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16075c918012c6---tosebefef.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2774b1d252---63785007100.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e26730a60a0---81916481767.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/95735012908.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921bd392026---72716370418.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f5fe36594c7---zafemax.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/pofotorozunivofagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=como+corromper+arquivo+pdfPDF 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

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_off0000d78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78D 18736 bytes
SHA-256: 1140fa4a38c2e87d3f21686c9f850d645c97458bce4bcf4d149c32556985bbd7
font_01_sfnt_off000105d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D6 10708 bytes
SHA-256: 9ab0350a2232f1f42b78c1ea508e37b8d1e3d780e67ca25b8f474338f9f72a57
font_02_sfnt_off00011e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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