Malicious PDF — malware analysis report

Static analysis result for SHA-256 1effb9ab4af3e592…

MALICIOUS

PDF

86.0 KB Created: 2021-07-07 13:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f13278c50852a0f037d56560ad83c68e SHA-1: d70e621a979a61a09851b38c6cf2ec3ae7c816e3 SHA-256: 1effb9ab4af3e592b33a6f4e6c8627978689494f2382daf04184fa6e1845a679
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765bd474ce6---jagigafefomefebinugelu.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/93fdae5780c31cc2c3ad788d22b47720/10984409750.pdf
    • https://serviceservice.eu/userfiles/file/zuwini.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b756cd3075d---58244060522.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/f396ac66b4416feedd5b1c6dda467e19/kakivamezixewiwe.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fe62d6957---28231859231.pdf
    • http://khodahoanglang.com/admin/webroot/upload/image/files/50417147106.pdf
    • https://gmt-tw.com/app/webroot/userfiles/files/totikewanugiwimo.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736b7b29963---14318769561.pdf
    • https://arerp.kr/data/file///9114681290.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/b54b235f91a437d3c7f72d2726890e45/84784507560.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16075cce1c23ad---8744186104.pdf
    • https://bd-sokolovska.eu/userfiles/file/togejuvulamutejul.pdf
    • http://livingkaneohe.com/userimages/89408918736.pdf
    • http://karpatskiles.ru/store/files/96400935485.pdf
    • http://sztarmedia.hu/_user/file/17553981596.pdf
    • http://gift-founder.com/archive/upload/files/23970949376.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607773e8ddd07---biwaxade.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608289488dd39---25741578557.pdf
    • https://juvelyrikoscentras.lt/Files/file/50977511418.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/d5136a5afb5b25cc2bec4d24ff357373/65146146732.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9eeb9f582---17247758827.pdf
    • http://trendybiz.in/usersfiles/file/2187607841.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8e2f415802c642dbe50bd5e1b5264aec/22682384927.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/7cde9094a563c08e09387fdb32ab0fef/wipukasi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=night+with+friends+quotes
    • 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_off0000f094.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF094 16792 bytes
font_01_sfnt_off000108ab.bin
6a7f85b0dfb954cbbfc5784b84a525116b50ac82f64582e5fea4ad87578f1369
pdf-font-stream PDF embedded font (sfnt) at offset 0x108AB 10732 bytes
font_02_sfnt_off000120cd.bin
681485e2137b364472ebacc715ecba9a80508ccbc11d6afb7268dc39f6bc731d
pdf-font-stream PDF embedded font (sfnt) at offset 0x120CD 16720 bytes