Malicious PDF — malware analysis report

Static analysis result for SHA-256 b236d3fa83fd3d34…

MALICIOUS

PDF

95.0 KB Created: 2021-06-30 22:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9ce2d9e9de94af4fead2ef768e5ddf08 SHA-1: 31e79fd1776b96d0537563987babcb442ddff53b SHA-256: b236d3fa83fd3d34100b0341cc4220d8d074ead4a1e92c787c19f43fe0219d7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous URLs pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The PDF structure and embedded URLs suggest it is likely a phishing or malware distribution lure, potentially delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/8d1773d5d58ad29f371b546453918848/31966998880.pdf In PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ffaeb3d3b---23486300803.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/3da1a2883505b3a5afe377dca9621b46/26551847246.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/0418b8bc7434f037723524851f7c6be4/rofoxaferi.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cabbab1a106---bupetakoge.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609841bb63e76---dejetix.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/poremakujobukekidatezen.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f8fa226e6---63615164324.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070aba62b31f---71595840717.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/41686715994.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/vodonixagifanumu.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/85079998627.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/fubaledigegetuperezu.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc78236c040---redifule.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/pimisunuvik.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/bn5oghbggggc8trh38rtmra4f1/78616660374.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/01e5f8a1635b417d7a613bc9f384211a/lamedalegimonel.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/denujitewogaza.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/a903da4167380aed6ca6a0ffcca155be/dobilijutejetakadepewe.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/db2f5e52aeeae04a4f4b25ca4f0fb67d/podufikivakujafogajadegoj.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/3e16f9c04451e35948011712c3201624/dakufajijuvonuvovalajag.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608796522d823---zixajomadaxaniwise.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-20/20210620125611290319.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d61d8a3dee3474706ea4dc1f65edf873/7332175267.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/nejexunuwalijexanozavese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=frank+white+fluid+mechanics+7th+edition+solutionsPDF 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_off0000fe44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11651 3412 bytes
SHA-256: 69c0b34795c7ba791de4bd22c6a2f55426294391976a6201749db20c31f13e89
font_02_sfnt_off000123fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FD 11044 bytes
SHA-256: 6abc3a5322d4215d5309a5765ff0e115e487338a83dce8bcaef05e3701d7066c
font_03_sfnt_off00013d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D94 18312 bytes
SHA-256: 3416b72904fe07688941dacfd5fcd8276c6558d4766296d81e799085048de867