Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f28651e0b5f635f…

MALICIOUS

PDF

90.1 KB Created: 2021-06-25 18:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8845546b1df4fec77f35068876662f1 SHA-1: 33c3b8c878a099af96b26ce227f18e0c7c808b00 SHA-256: 5f28651e0b5f635fa60f54d206f664a845f711af2deb0df39975fd0a51a35fd2
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document exhibits characteristics of a remote-support tool lure, instructing the user to install or connect with such a tool. It contains numerous links to external sites, many hosted on compromised WordPress installations, suggesting an attempt to distribute further malicious content or redirect users to phishing pages. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://crysiq.ru/uplcv?utm_term=pokemon+red+and+blue+online
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d16ccdad8---voxipabaxenovuba.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfc565fb0d---sevuruguwel.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd501151cd---fogesaju.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/deluwogukosonalo.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16095b703367c8---64701042574.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a91148ef8---fuvesexesixupoxijaxivo.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160abf3c789911---pelulujinuledi.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160866218c888d---nenefuwerofomeg.pdf
    • https://hmanagement.net/userfiles/file/puvexozolejutokefivag.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/xukupefeju.pdf
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/xutajuxezovuno.pdf
    • https://camgloberealtor.com/userfiles/file/19271825493.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff6ca7b049---texep.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03327e687e---pepejixewab.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cae2f281c82---vajabezebomivovi.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff7269f8a6---11503715277.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9b51beacc---62484985310.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a1a41a761---62066731158.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/4872021ce49adecf3a8f5c341847df74/28266681675.pdf
    • http://akinmedical.com/uploads/file/54802268643.pdf
    • http://dharmapremipariwar.org/userfiles/file/68428188864.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/102d2593c99fa4243bce046ea9232ff7/borubajesadawubuvi.pdf
    • https://xo-sound.ru/userfiles/file/52177394436.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a71c763c00---komevifudupinetabonu.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715bba751bb---fapenabolusogewuf.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/0752c5a0e2b6379faa6ce5cea7ed5871/papufakoberun.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/88fc0d3cb3ebf53f9e6a035dec94d34d/mulajijuwovojonanil.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/ba2a2b8d8f854ae0cbf5b15080b0947b/gurusunigirovefewodanidak.pdf
    • 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_off0000fb1a.bin
24231602ef541e1f055217ec44a90ed894b50e7889286cf1d4e2056a27b22cdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 18020 bytes
font_01_sfnt_off0001297c.bin
0216c6d7eacea919e1ee34b370c5cb3a0f73cb581e4657578de18f6e58ac39eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1297C 10476 bytes
font_02_sfnt_off00014127.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14127 16792 bytes

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