Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d4e97ecd39ca82…

MALICIOUS

PDF

90.3 KB Created: 2021-06-26 11:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb905b03dde4e36a9b6aed1b565b0ae1 SHA-1: f27170bff16a3848d30e80741e121e7a0fa28466 SHA-256: a7d4e97ecd39ca82eb1a452929556c69998ab4ceade04fd26c8a5a9fffdc53a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple URLs hosted on compromised WordPress installations, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/fgfuk5pdi88onvci8brorknam6/9931320603.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c519a035f6---56622039310.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/2512110532.pdf
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210529015948.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c260a591a---19327388982.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/5a2a035e9e068145acdaca11d1ea177a/84844596536.pdf
    • http://cephedanismani.com/images/pages/file/19513420538.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/1miul3ovh91g7ki9bchae09h8v/86848184570.pdf
    • http://branpc.in/ckfinder/userfiles/files/96152825813.pdf
    • http://akicgiyim.com/userfiles/file/jujagasowol.pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/24138872066.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607190745e7c1---25622477219.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/75430931282.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff08cb4e0c---52248029759.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2963c928a48d15c7967d9c262d7a72e7/napimaf.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb4b93288a---jurupanejo.pdf
    • https://luminex.pl/upload/file/gokazugakemubifibe.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a4de789c4b0---zalafesuri.pdf
    • http://ligneus.hu/upload/file/dobef.pdf
    • http://arniestribu.com/campannas/file/44193082148.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/fs7o1cg1qeo7bdmb3c6cke3rm1/95000895952.pdf
    • https://cowichanseniors.ca/userfiles/file/38635880897.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=painting+diploma+courses
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e72a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE72A 16792 bytes
font_01_sfnt_off0000ff3b.bin
65d2db144c93b891c93abceb9cadbdce46e75894cf1fc40aca2f2412ebf6d896
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3B 16200 bytes
font_02_sfnt_off00011508.bin
cabab932724aad100eb60e46d57b4b8e152515b887bb8dbc649ac1c6ab7ea8ad
pdf-font-stream PDF embedded font (sfnt) at offset 0x11508 17396 bytes
font_03_sfnt_off000142ac.bin
fee514804d660f43f03c59800f3d4fdb55254755f5a5729d04da5f5f83a048b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x142AC 10960 bytes