Malicious PDF — malware analysis report

Static analysis result for SHA-256 38f2456229865aeb…

MALICIOUS

PDF

98.8 KB Created: 2021-09-04 23:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 831d127f0ce39383c9d2fe5eedd26c28 SHA-1: a85ef4adb5afa9aee175389e80ebb92879eeb440 SHA-256: 38f2456229865aeb9e82e9304e4b50d4ca1466c38a9e4f3a3f44d71aabfa64a2
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such documents for SEO manipulation or to host phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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://tgtech-auto.com/userfiles/file/sesivibapexezusevabu.pdf In PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/80471425192.pdfIn PDF document text
    • http://raykingcarroll66.com/clients/2/29/292092747e06e0ab09130fa737b110c0/File/zosenusil.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/vopujazitotuk.pdfIn PDF document text
    • http://zae.me/datafiles/file/pulub.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/70926749913.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210509213840816.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a1f9dcf168d3a86b499ed92999b04f3a/31731099272.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/nanuxetegutewofu.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ab599bf6f---22754311105.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708f565ad35---75953806242.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/pugulefufi.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/fojedugazafixagad.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/242016127592.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/tewizemonet.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/93399eff9d05aba954097cc66b65b718/konatuguzemesunuwope.pdfIn PDF document text
    • http://geodez.com/pliki/file/xaruxefise.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310721c1f7b---wikirexokulopa.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/19600118110.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/walugoxinejemisima.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160de548865d50---32892668479.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/95635327518.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4d1c70aac---tuxep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=allama+iqbal+poetry+in+urdu+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60B 24504 bytes
SHA-256: 98a307c774449a22ae1deefbf7d221d0d35dd3285dbca365f238622f397cf216
font_01_sfnt_off000133ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CE 16920 bytes
SHA-256: a4ac3e31da979e151157760627f849dfdfd592ebc651b9abb4712cb88667f654
font_02_sfnt_off00014c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16486 10972 bytes
SHA-256: 7a57de9a0837e1cfb00f3cb86ea8e477af9bc684faba116e883d7a70ef27a086

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