Malicious PDF — malware analysis report

Static analysis result for SHA-256 411e57263bcb23e5…

MALICIOUS

PDF

73.7 KB Created: 2021-06-30 15:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3bac156104e3e1cd2d4d34fb6a5112d SHA-1: 55548b79d5df5d74729cba37db90b551dd0a1396 SHA-256: 411e57263bcb23e5cb5861d0831c851ab0c6e6b9322987f6f5d51764223fba53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload download.

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 http://gpe-el.pro/ckfinder/userfiles/files/wupikaguvogonobip.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a35ae498a68---kupowuxemafosaxabixowevi.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cff15b1d545---rifogeguzu.pdf
    • http://piau-po21inn.com/CKEdit/upload/files/25192781184.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/f1164e70453b9516677bdaa719a9f1f6/64204115179.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c03928d115---88304629964.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/5aj043csnonmj8fhmnk5kh0oe5/18590149273.pdf
    • https://senhewood.com/d/files/wawabi.pdf
    • https://btcauction.vn/hinhanh/file/katisuzakevawopenemali.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b362180cb36---89633450326.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/1d1tutmnv5c00jlsejo2evjlbc/64483288293.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/64v7ssae143c5tob99ofs4rc05/soditoturuboviwifijajaj.pdf
    • https://bnbcostaverde.it/userfiles/file/19028383719.pdf
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/basir.pdf
    • http://gld-lining.com/user_img/files/77864489514.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/053f6a19af71bfdd9bd88bf7d02d1e66/matitu.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71ba51862---15377198362.pdf
    • http://enjoy.sk/editor_uploads/system/files/49641611724.pdf
    • http://aj-logistics.com/stock/userfiles/file/11351861032.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a408ce6705---kevuwogimidavuwirobe.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/89137342336.pdf
    • http://tgtech-auto.com/userfiles/file/xegemefenerizodir.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/7qgmtelj9u5f01ijqcm5tcr4n1/58059690130.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=apostrophe+worksheets+for+grade+2
    • 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_off0000bcf9.bin
8a37d7349437a1085d9a893f7a426b301726ddfd49c32ecdf9e1a776c7883022
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF9 16724 bytes
font_01_sfnt_off0000e85c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE85C 16792 bytes
font_02_sfnt_off00010073.bin
0eda14031038a873206b31fd5bedf7b2e31cf81c10decbe3f2216bef56e58ee8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10073 10812 bytes