Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa16c45441673f4…

MALICIOUS

PDF

98.9 KB Created: 2021-06-29 22:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75c928f33f6b95dbf6f9140adf4d2d16 SHA-1: f1c9b32d17a019b7107cfe7522126542231a7615 SHA-256: 8fa16c45441673f4de4aaf8b4d3e3cabcc53db9fb5823106ec1c930c4afc9d99
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDFs hosted on compromised websites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs point to compromised CMS upload directories, a common technique for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9789

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://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/c706ef1776d63b69025a2917f4953116/vuzasepuguvejasemu.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a49a9474ac---xivapusamedexavu.pdf
    • http://windmill-bv.com/userfiles/files/rubefipiriguwavu.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/b8b103436e001e97a09373d92a9b4fdf/18730875372.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940d37a3bb8---41634861725.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091917005c7d---85569551297.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/930945pejuhhks4g6rmaffid7f/57990190410.pdf
    • http://sistersaviopublicschool.com/userfiles/file/rifev.pdf
    • http://amon-syotengai.com/userfiles/file/31432549921.pdf
    • http://apluskleaning.com/admin/images/file/nenimasemolagux.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078624081700---limajujizidakuzaguke.pdf
    • https://2acontractor.it/images/file/gunukubaxaj.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/0640f01e19ac92baec140109d8624ede/novixemijukezuvexosiwatun.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d916339778---85909931618.pdf
    • https://al-farh-iq.com/upload/userfiles/file/faxenofoluriw.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a15abfba27d---10389130091.pdf
    • http://softwarefactory.nl/images/file/waxovovunugoxujino.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160954871ac3ad---98476891937.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/a49331107a6d531001267c88a00b5840/23996474850.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b146dc857---33983919717.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e7252028f---fitoxu.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/8e7589f124627ed5f3ab8b5dd415aed4/50136345996.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/7d1821d76d71a66907bb642255a7678a/27287326015.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c779d6e070---ninifigozofijogisu.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/bc7482de77522e4aad85d5a760e5a6ce/63702551379.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=went+simple+past
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b7.bin
67cfb5c0c2838949d0c838a330dc5793b111345600210ac816b78464f8b0ccf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B7 10188 bytes
font_01_sfnt_off00010785.bin
b5ed04e210fce30409cdac4231f8d3924ff5d3b03b24fce5ec9c1de87925fbf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10785 3372 bytes
font_02_sfnt_off000114eb.bin
fc09f67653e1f54e619fd4c596dfdcfcec5150f7d2af3feb586f58b701fc3b0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114EB 20728 bytes
font_03_sfnt_off00014957.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14957 16792 bytes
font_04_sfnt_off00016168.bin
b387f1ee52a169344bbd8b02c89370a4acb749919e9a288d33e52761134a4906		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16168 18012 bytes

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