Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7b73551f8cbd996…

MALICIOUS

PDF

83.3 KB Created: 2021-07-03 02:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c772be0864cfc7b20c2cad8aa7038fd3 SHA-1: 790f151b8800adbc7dd3cd7b8e42932a715989f9 SHA-256: b7b73551f8cbd996b500225f01aab621da8db35a879204ef03bd3ad84b34c75e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and disposable domains, indicative of a link farm designed to host malicious content or phishing pages. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these external links. No scripts were extracted, but the structure and URL patterns are common for PDF-based lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/o0idg9gbaadtuhgvt2rhog6hg6/68114133975.pdf
    • http://banghenails.com/upload/file/53606456017.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c965d8ddd5---gunavogawe.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/2d1qbqm6fgttfto855pu4vl9rv/13820087253.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d1a1a16a2---vowulexuraner.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/842311a7bc53605aea077042d6495c59/lozafevamonaxosanifu.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/1a0a9325355d2097f5135aef4367f3f5/22218646991.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609469fa0b3c6---89813083822.pdf
    • https://ahreco.com/uploads/news_file/tadakifusowisixexov.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e042d3ff8d---pofesumijejos.pdf
    • http://kolkandkolkdesign.com/site/data/ws/files/biwopasolulizuro.pdf
    • https://lacaune.hu/userfiles/file/lozedekod.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/1bbba953652ccb169e73c9194f647bb4/dawilomilo.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/20c0b711808678bca8fc17cf36a0e25c/98816618350.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a731f285fa2---41529316688.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795385a2d29---tubum.pdf
    • http://gomientrung.vn/uploads/image/files/ranetexivunikoreri.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffa2c6cdef---84091056652.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16094c63f4e846---befutupu.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/225e00f81d5340788bd35c64ad5ed331/faluwakiruse.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd328caef5---3555136059.pdf
    • http://kozelskadm.ru/files/uploads/files/63563065695.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607193477b553---48396241031.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=catoosa+county+tax+records
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3eb.bin
dac47b4879c37bd509cace7ea0f7513bd16bf271503cf8ea05bd39fc8ecab036
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EB 16780 bytes
font_01_sfnt_off00010fd2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD2 16792 bytes
font_02_sfnt_off000127e9.bin
06fa25995a6a62489140268a7d484124be45808b4efe541d3f287ea9ae9e4c51
pdf-font-stream PDF embedded font (sfnt) at offset 0x127E9 10572 bytes