Malicious PDF — malware analysis report

Static analysis result for SHA-256 3537df51f0b5eb24…

MALICIOUS

PDF

111.0 KB Created: 2021-08-03 11:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ce197af94910204849ec6669c7190445 SHA-1: 7cba9c0b07cb7294755bf7d10cfb530771c1d7a2 SHA-256: 3537df51f0b5eb2435398acc3a3113ee6fe5cc524202311a4753ba1e45ea3662
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are associated with compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristics and URLs suggest a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c24df2ff17---82206700231.pdf In PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608650cb4d6f4---36746667071.pdfIn PDF document text
    • https://alutat.com/data/file/podoxexatesunetajibovaviv.pdfIn PDF document text
    • http://clarkhigh72.com/clients/3/34/34275c7d49a174b5f6cf03bf5966da6c/File/tunenisulumanugadop.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854634a7afe---4478674820.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5abf4af2de---dupijisoxivuwasive.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/zuzetefovesirubebatapika.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/90679310749.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/df645cd704e26c074ee571b52b43f29a/mavojaxebujepun.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/ddd09f8400c5c9001af46dcdd3519e54/wupewunafofode.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/21aec4137586593bb1c67928d1e02eb6/14945035819.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/fa4fa4627abd72a2e9562f7c5bed4a0d/2591487555.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/togasisimogefidekitawesep.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/8b26b908ccbd22bc3e11c315512e8c81/linupup.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/rekuxopaxofo.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/xixefomez.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a0413d353eff3c3591f02186eecd6792/sawevusurokivobu.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/43111802135.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/2033678008.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/rufutagimixifoxa.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21c639b695---38205817252.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/03176719f99962209d0bb6c001d17b83/bunopa.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/75544685606.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/nuzoniloditinulupubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=cuentos+cortos+para+adultos+pdf+gratisPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4F 10928 bytes
SHA-256: db5667c7de890e36b224536f83266a44de3fdb928173b87efae61f05d413ab8f
font_01_sfnt_off0001488f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1488F 19344 bytes
SHA-256: 01912fb8a8f360a0a92ed7d4e658fc684f44b65db5aa150c8d99559c76f886b4
font_02_sfnt_off0001797c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1797C 17504 bytes
SHA-256: 0b4b2676aff05a369d4163ffe00cf7f13052446fb04b9aa9e6dbf30e7d948870
font_03_sfnt_off000193d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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