Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6f7e1b64d16969…

MALICIOUS

PDF

86.3 KB Created: 2021-08-15 15:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a79437c0f439e07d516270d51704a6f6 SHA-1: 4ca6ffc97fdcd0a4eb0fa9c4409f598935610235 SHA-256: be6f7e1b64d16969e4ab6886e345d1eb7431d17d5c8131faa86a8f761c5e8ecd
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://usateatop.com/_upload/files/fesejafujatisopamivapug.pdf In PDF document text
    • https://radmangroup-ye.com/rgfiles/file/lipuvowurinazeladofoxize.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/864472d346acb35c42f6604739bc4108/76179207505.pdfIn PDF document text
    • http://multifamilyfoundation.org/clients/3/38/38c33163524538bb895552046de0b362/File/48682921933.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/rukolati.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/32939743495.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cd888a399---53365838863.pdfIn PDF document text
    • http://statenbracy.com/clients/d/d3/d362857cea7b6c304c7898dd6c6993b3/File/devomafuxas.pdfIn PDF document text
    • http://simonide.org/userfiles/file/vodokufolutum.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c6eba041---75029047240.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/mejebo.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/79162656885.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082fc1648cc7---povivid.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/hjk5v5bt7b73gqluui6cl7uoj4/32190949587.pdfIn PDF document text
    • https://people11people.gr/uploads/File/darosenimelisofoginanov.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b3a7955f658f2295ccc3aa66b25de769/xumeburogowof.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/65479234910.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aabf16beb2e---jebexatad.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/72384624667.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/5kupljrhbj17pmsme9hlmk1lqq/28600829922.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/xewukafub.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/lo5nrlub97klcnvct27onmj6vd/zureraku.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/5ee1769e74c76798fdf2f5c225164162/64518042064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mckinsey+approach+to+problem+solving+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 16688 bytes
SHA-256: 5a4c2e3270ca940d9d02af6c42321081b2b0175201ec21892108ccde5dabeec2
font_01_sfnt_off000118cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E2 11472 bytes
SHA-256: 8999862075c2a2ed79de1e65150861a364f398d766d63a1cd9597cdf5c5322df

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