Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebecba3d546fcdd2…

MALICIOUS

PDF

73.3 KB Created: 2021-05-10 08:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1368f4054b43aec7077de6ddf6b9535 SHA-1: 8550265c993df92070f13577606cf8d7dff533e6 SHA-256: ebecba3d546fcdd2b64b4bb12938c7a5ed888efe03212b5a2df65d18cec29e95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised WordPress upload directories, indicating a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098356ed261f---89602499027.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/e0f5aa3b4cad95a24c3b9da12b4ac7c2/81836484835.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071723129e2b---68635425134.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/447q9lmcbropvae9g6vh7udvkg/fuwogimuwigixato.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087fc1cd9e46---5901007829.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/b28c167d4ae108b9b054e55a345f7a4c/rinibupotikoruk.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/lisosowa.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/0c5c86aeb56c88237d1d54cc31f30ede/54781816853.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c71877414---dawufaraxuni.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/2b2893d75c907bb75af9c5b7e092b18f/tukelesiwosonaxo.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/a461eb71b3cb5519e7a6089a85c49332/bozupopelizazugefotepakaz.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870ab51e3da---fobawapulaleme.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160891483ed7f2---30628016186.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757687ac7c4---fekilovagisuvejozikuga.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/0af1d72125fb7a0e264981d6cb1b7073/donixo.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/2086948399ce5a5eaec09bc041481346/93421049878.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160825aa74a614---70735089684.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%252Ffile/80660180992.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608235acbfaf9---vovivize.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/219ab91a481ce14eee5bd15b0c793678/genegi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=android+studio+3.+4+logcat+not+showing
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e909.bin
533f426ec8fc803039b38c242b2226fc88023b44563e43e1061e10569a4c4e9d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE909 5568 bytes
font_01_sfnt_off0000fc1a.bin
380eba3b126dd068f7767d639651bc4c49c1d01685f272cc51af19fc0d959afd
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1A 10260 bytes