Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a79315ebe662b2f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 02:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea9b16fb0952f175eb40641ea26ecbcf SHA-1: 1ec070b5efb9fac49957c4ce9e9ba47bbc8e2d16 SHA-256: 7a79315ebe662b2fd525a8b257f70125b6ee116e375bec2d1b59c0226402486e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wastran.ru/uplcv?utm_term=wcc2+hack+mod+apk+download
    • http://traslochimontalto.it/userfiles/files/pajolapufexarir.pdf
    • https://limsurempat.com/contents/files/xizimefiwefobonekavala.pdf
    • https://eol.org.pe/ckfinder/userfiles/files/ziwevan.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5b19b36e8---zuluzapo.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/26564f6b5f7374326d87f2bf1c739f1c/zifebawapivojuxev.pdf
    • https://comobrew.com/newsite/images/user_uploads/file/18992801999.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144178c99c21---87876902825.pdf
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/ruxabelezarawuf.pdf
    • https://gppacdatabase.net/userfiles/file/bokefo.pdf
    • http://denki-shonan.com/uploadsfile/majalu.pdf
    • https://sgotomotiv.org/upload/files/33958363068.pdf
    • https://wemservice.com/ckfinder/userfiles/files/11519785984.pdf
    • https://nmg.lv/img/uploads/files/65960050362.pdf
    • http://polipadel.com/userfiles/file/diliki.pdf
    • http://skncn.com/u/files/vipugititifubabopejuvub.pdf
    • http://marcus-1.com/FileData/ckfinder/files/20210915_2B5A0F1364F563BA.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161355a8d29a80---81550054919.pdf
    • http://kingkady.cn/uploadfile/files/63876272823.pdf
    • http://pastoret.it/userfiles/files/1346917361.pdf
    • http://csc020.com/userfiles/file/20210909105431_m59i1h.pdf
    • https://arte-salon.ru/upload_picture/sewerezegibi.pdf
    • http://villabrown.it/userfiles/files/gijiwegijigutejefifazige.pdf
    • http://thietbikhachsanvinhhung1.com/upload/files/1299155761.pdf
    • https://tttinox.com/upload/userfiles/files/73529823912.pdf
    • http://hueide.com/upload/files/digizasowosoj.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_off0000d9aa.bin
e24f895db9b2bfa86e58490f643969c5898a9efe96350a43b64dce778aea20fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AA 10480 bytes
font_01_sfnt_off0000f15e.bin
8a6fbb72ab32af2dc6327e835b3cfdd05bf724403df04eaf296b0191e1411177
pdf-font-stream PDF embedded font (sfnt) at offset 0xF15E 17584 bytes
font_02_sfnt_off00011ec8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC8 16792 bytes