Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc80ea16edfdebe…

MALICIOUS

PDF

85.3 KB Created: 2021-07-06 23:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf43cadf52d0b0c207fb36fefebced4b SHA-1: 6217b9aef42032f6b6da1794628d6510a1853fcd SHA-256: 8fc80ea16edfdebe69956ab0e1e4b5c45cff75776b5a26dd059dc57ae82a34c3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged as malicious by ML classifiers and ClamAV. The 'SE_CLICKFIX' heuristic indicates that the document likely attempts to trick the user into executing a command, a common social engineering tactic. The presence of numerous links to compromised WordPress upload storage and disposable hosting suggests a link farm used for distributing malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16083a705d7ba3---13635453281.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/66911713026.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/74e6436e2e835fe1aaf1f76b0569dcb1/lazubekif.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/h89f8ronkb7gq2iu7578hat4ve/riwirezawoxadupowe.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/bcc21358061a9752828f37468230714e/59691391221.pdf
    • http://bowlinggreenhsclassof66.com/clients/b/bd/bdf8ab256cd88a603fc2b95a051c5839/File/72787082619.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609207d65f603---kuvitexogisoruwosukesowa.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5476044c5---91709196687.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a127e3d6d36---fadev.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609447dda4e52---60332723642.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c1f346ed2---59170614601.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/1233eb342e4a2955d3b8b8b67eab1c30/lusolukiveku.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbb8de046e---37762024854.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/66057592390216b149d98b9b8386993e/sawerevow.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/plm6okeonb93td1t7fuo9e4vkt/32510942495.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160713cc27ca66---miruwexodubod.pdf
    • http://ruresept.ru/files/file/54153434140.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/3hm29pmuv673d739d5gmmb6icq/87487845361.pdf
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/16655297406.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16073ce91e3965---2832680140.pdf
    • http://stinpo.com/ckfinder/userfiles/files/wukigege.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6e4d59094c5b627fb85b212f34482db0/wasobutupogaxuviv.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+change+the+colour+of+the+highlighter+in+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_off0000e8ca.bin
f6ea3ed58bfca861a72d56c05c4af6a3c24dc62895399d769454aadf018c295c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CA 10908 bytes
font_01_sfnt_off000101c1.bin
f83a8bb672f5fbec34f0ff5e15905cd777f07108862bedec02edcfc7719a02ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x101C1 17576 bytes
font_02_sfnt_off00012fdd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDD 16792 bytes