Malicious PDF — malware analysis report

Static analysis result for SHA-256 773f97d7aa6a1ad4…

MALICIOUS

PDF

90.6 KB Created: 2021-08-08 07:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 24435f8d02d09d714da52c7a486d3d25 SHA-1: 6f0133e446617f45b5f5982f63ad4a8aca1afdaa SHA-256: 773f97d7aa6a1ad4a14a2260ef5cebe2031710a7a1f2b096bd9230464740b5dc
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a link farm or SEO poisoning tactic. ClamAV detection and ML classification strongly indicate malicious intent, likely to distribute further malware or engage in phishing. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/je19ob9qdfu990mc26ctcvamg4/63810209256.pdf In PDF document text
    • http://dragoniresorts.com/userfiles/79550450904.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/daweraguropefagefo.pdfIn PDF document text
    • https://alutat.com/data/file/femejop.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/lexeregazeb.pdfIn PDF document text
    • https://ayurmitra.com/files/file/99960533805.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/88bdaf6e4d158909adbbe3956893932c/wubovevagilalumapez.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/favilinefopure.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2a4d7bac7---67464244186.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/80600870092.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4deb0368c---67101812468.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/45708477751.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/33250668547.pdfIn PDF document text
    • https://birotex.rs/images/files/2415438850.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e13b7a9d9---97638550753.pdfIn PDF document text
    • http://islandpointfl.com/userimages/basuzitenijadiwoxonolejaz.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e93f012e0---nebupalapalowago.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/luxunuvobaburoberujumuj.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089791b091f7---nigetojuxok.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/47e27234da994691f1f4d7024ad7e70f/wizonifufewatawutuwo.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/fanoboxigenokupefe.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076624a017a3---badopugetu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=types+of+cadastral+survey+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0A 10660 bytes
SHA-256: a090fe6dee40f2c1f46543321bfcba0549e86e203cecfec714cb389c186bfa7b
font_01_sfnt_off000117b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC9 16948 bytes
SHA-256: f63eb792a7ba34438fcdcfda004c9f5f7a22e275c46e687a22f834b4fb4bcfdc

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