Malicious PDF — malware analysis report

Static analysis result for SHA-256 76456a1f42dd255c…

MALICIOUS

PDF

83.5 KB Created: 2021-06-20 04:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ae74cee888e773ab0542de7e9e20b2d SHA-1: 0abfa3e44242473c813008fd134587858d878bfe SHA-256: 76456a1f42dd255cae201339e093bada35126de0f1f75b5dbad0829f2456d94c
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised WordPress upload storage and presents a visual download button, suggesting a lure to download a secondary payload. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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 http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e70b087820---sixufosepogatalejigosit.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/f92298e2d2548cb80612c19db2246ec3/11445015977.pdf
    • http://aliceinformaticasrl.com/user/pages/94690560956.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/5888c2393858eee91eb87dfd939b85d0/zimanonufutak.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ugbf2ps6003g5cipu2mb0a8d01/19991237792.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/9f74b86c8bd6ce35bdcbed6d7bac6857/25070228424.pdf
    • http://i-dron.cz/data/file/rofigukovevugageju.pdf
    • http://kochamsushi.pl/UserFiles/file/85260352068.pdf
    • http://progfin.pl/userfiles/file/gogedakuxebixepajotoli.pdf
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/16444897745.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082f781db188---96158631450.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ee2eac99abd53fb168c66b8d8cfe96d4/napobowatozibufiwalirok.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a8790689d---mipigovejowujujem.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c9c10a076b665d7cf2c9476ed7622623/darukevunoxoxojali.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b60cd7005---98738893516.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087f20cb4606---50111051379.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=isaimini+2019+tamil+movies
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe2c.bin
766bb5eb09e30e60b0cd88e8df5bc336a58b5b16dc1711c7a74755a4a6c48b23
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2C 5212 bytes
font_01_sfnt_off00010fd5.bin
19d579821e83c32cd478aefcb57f849508ece8625c42f2108810477b29a00d2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD5 1936 bytes
font_02_sfnt_off0001191b.bin
76d77d2519964cb2bf9ccb945087121b84a33f2809a19abe9e4dcae9d23f6d89
pdf-font-stream PDF embedded font (sfnt) at offset 0x1191B 11264 bytes