Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1af079bcf2f9b69…

MALICIOUS

PDF

80.9 KB Created: 2021-08-30 00:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3bc0753db66ccfb693e0f9820799515d SHA-1: 5b7e7d1d5817ab8dbd15d59dcae8f72cbd66058f SHA-256: e1af079bcf2f9b69a95e8345f1e9d8fc90d0a480753bb4e27a7559be93db5cd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The primary attack pattern involves tricking users into clicking links that lead to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=top+websites+to+download+pc+games+for+free PDF link annotation
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607246c733800---tutobeb.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/kajagoxinutomuzesubuxaj.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/xawegaxuvevelaweluw.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/nirijegipugizesolu.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e4b17dc39---zedilikujurotolasat.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/26370513781.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/48646040629.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607150ba9740d---sevawamid.pdfIn PDF document text
    • http://ewtch.com/upload/files/dareropofuvepamedenapi.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd3e426cc8---9048698894.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/ginenurajej.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080afbc31f6a---61850860668.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd897a7d5d---28246905525.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/61105859640.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/tuzadifiruxotewume.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/9mncd8cp04r20cki2t74c940ki/vawepazavo.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/95046904068.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/mosavubo.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03050a2257---sunasofusivofizigizokonib.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/81470490466.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/08/18/file/35411134704.pdfIn PDF document text
    • 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_off0000d607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD607 17824 bytes
SHA-256: 61aa2ae9c12b3987044c3d9bb73acdf440a939a7d9c0a26afde7d55f0b440f85
font_01_sfnt_off00010419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10419 11152 bytes
SHA-256: fe61bfbb79cca172688e36e95e3d469e3df4f6981acc2e60fc187e4e9ca4fc84
font_02_sfnt_off00011dc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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