Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3d8b81793ab197…

MALICIOUS

PDF

89.2 KB Created: 2021-06-30 12:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba9183f2ce1e3d9e9b4ddb7ce66bea5b SHA-1: 1740c0e0d46bb13d8c0ea542848e25f4339b38ec SHA-256: bb3d8b81793ab1973c0583b1d5798fd4b7e9c21f625f8056d84657c229607993
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://mamo-tato.ro/userfiles/file/redape.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/45aac22fa532e925480d952e3726a446/jowomo.pdf
    • https://luminex.pl/upload/file/gajojojexipuduripe.pdf
    • http://saokienviet.com/uploads/image/files/lonuruxuzip.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1a8797d04c3743eda4abac86a2a665da/43744652603.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3d0113eab---rozunafut.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/cb75a73acd0d8b351964696a56d1e130/tiwuko.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9626e45ce---90521624451.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/feb572504958853b6f425b4ba553ba38/34444633877.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/eimr6t0o1o2prk2pk63p8uhp1a/xawiradifudavidafag.pdf
    • https://sanxuattrucauthangkinh.com/Images_upload/files/ripibiveru.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a38c4fad44d---tedewurijofa.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/lui6vkjbk8cp9pu22i9iouif43/melabagewomafiz.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607151ccc2341---38069612994.pdf
    • https://tamphuctriland.vn/upload/files/72880844425.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b2e3ed483ba83e426707f6c16095a455/7183984473.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/50ac4ce58a11436738be30038cfaeaa0/bodategomunibubupaf.pdf
    • http://immopolignano.lu/images/nebuli.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/po2r5b8uji2nkt730k8nj8sm9n/zuxik.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790321a4e1c---65659896016.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/a87677c82d97f31715c0087b1b44285d/79586091931.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6a1938b9c---bogiga.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609b30657c633---vinikavutagozid.pdf
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/1788f914a8b24834575e475edb9cd40b/bamoruzefigepa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=bailey+and+love+27th+edition+download
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1fd.bin
e3a1ca7fbcde87b6e2bc585668cff1a50452d2a09c95c546c16e9f90aebd6500		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FD 1636 bytes
font_01_sfnt_off0000f9cf.bin
9dae4c884829adb78ff9f52de80a9efd484ab857474be6a17404ed4b8097682c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CF 10564 bytes
font_02_sfnt_off000111fb.bin
21f447de4165682591ecbe6803473cbcf0c0faab8038b07711c59ae8dbbdd30b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111FB 16624 bytes
font_03_sfnt_off00013d0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D0F 16792 bytes

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