Malicious PDF — malware analysis report

Static analysis result for SHA-256 5153aecbc40f0c12…

MALICIOUS

PDF

86.4 KB Created: 2021-09-01 23:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfbdc19045c17b8b8518f69df71fae30 SHA-1: f8543b5a06a78de2cb88e36777a81762ab72404d SHA-256: 5153aecbc40f0c120c45ffa43d5f833ec47d7ee67f7d0352678ce502982deb48
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the 'SE_DOWNLOAD_BUTTON' heuristic suggest the document is designed to trick users into downloading or visiting harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=bypass+frp+applications+techeligible
    • http://cmtdental.com/upload/ckimg/files/losevisironuz.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/osrcue835j52q06is0pedbeqs0/demivitub.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acce47bea0---dalugozi.pdf
    • http://graficaeformazione.it/userfiles/file/52708912956.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac605a52edf---mumadozo.pdf
    • http://zdrowejaja.com/Upload/file/96891798914.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/69603797603.pdf
    • http://chichen.asia/ckfinder/userfiles/files/kimogal.pdf
    • https://unosms.us/userfiles/file/xobep.pdf
    • http://a-swiss.com/upload/userfiles/file/45128334901.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af01416aae---74043922312.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/bcf4f83c9888060766cbad932082b9ba/zanawuvofimerabarofamutu.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/3c0gpkj3up8rhl0tmq9t7ie1al/wikosunijijadefitoleje.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/111412e18b5c374a4d8b4cc93cf58917/42026231942.pdf
    • https://allmassage.net/upload/file/20210713200411.pdf
    • http://ottomaniantextile.com/userfiles/file/simazopolavegexabozosomo.pdf
    • https://hanurichurch.org/ckfinder/userfiles/files/22495905656.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0895256df8---31266094634.pdf
    • http://hong-tour.com/FileData/ckfinder/files/20210626_4908959CAB67598F.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085908d6b2e6---68268031740.pdf
    • http://jkohut.pl/file/dikozoranefizumemubu.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160741899cffc2---55610302691.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160acc738c74ec---pexozisejetomore.pdf
    • https://chmelo.hu/sites/default/files/file/45995388247.pdf
    • 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_off0000eb38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB38 16792 bytes
font_01_sfnt_off0001034f.bin
7fe8b316cfd95022d9fd3cad394989cf6a15219360c998669bb5fbef2387a965
pdf-font-stream PDF embedded font (sfnt) at offset 0x1034F 11064 bytes
font_02_sfnt_off00011ce3.bin
87a7499a8612081b5ab31e2b64d8c535c8b34012bc91e120f312ae2ffa98ddf8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE3 17744 bytes