Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2529218f8c9886…

MALICIOUS

PDF

114.9 KB Created: 2021-07-18 00:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97bb86abbf3ff3687dae72dfc06c7bb6 SHA-1: 01daf660f904d289760e4483a5972a555343bdd2 SHA-256: 6f2529218f8c98864c96109f98772b3b09d4cadab0e74793826936ff46f8c17a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites, many of which are WordPress installations hosting PDF files. This suggests an attempt to lure users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e82a185ef1---xuwabuki.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4hsb7igrjpe5bgdp36iark9qf9/74904689263.pdf
    • https://abeess.com/userfiles/file/36752389305.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa7e8a3a1---31987922639.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f7e6b4f19---xijajuvibaboromine.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/1914bc738e6f679cb9d11cb552efdcce/16004019786.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5d8328d8c---49463269742.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/nn4drlriv98ho5p554fpef78oe/67600003821.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/2tj6j09mo4sg4cpeemk2s54phn/61911547646.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607305b006241---35539869435.pdf
    • https://zlatartopalovic.rs//files/somopusoxodizadediv.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/0senmgio3k06jshbjfmg1b9fuh/79282323207.pdf
    • http://jl-vacuum.com/upload/files/2039192270.pdf
    • https://progin.ch/ckfinder/userfiles/files/vatonixoduzukol.pdf
    • https://xo-sound.ru/userfiles/file/65160205670.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1631367b8---kugefe.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9823fd60df---87777389751.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/rrrq8p3sjjf15iufrrdg5td9b4/73506442139.pdf
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/bqf2qrkbpb4pnb1ev4fl2lrpcm/30281734557.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b303a34c7b0---39388892325.pdf
    • http://ampletrekking.com/userfiles/file/76636612364.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/662879f69999526e408eb55a8b0af6a7/92263139619.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869cbd01f4b---megatonotesulapipavawip.pdf
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/2j6baiiupi8qsf9434n8hvvrdr/6661482040.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=clash+of+clans+leaked
    • 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_off0001607b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1607B 16792 bytes
font_01_sfnt_off0001788d.bin
200e3c70812eedec847e47154c6abaa84d953b1a92ad75e2b6caa123dcfac948
pdf-font-stream PDF embedded font (sfnt) at offset 0x1788D 17708 bytes
font_02_sfnt_off0001a6de.bin
3a603471d5e15575c705e9edf0f9dd7995850e1f190a762c59d474e7c2d313c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6DE 10408 bytes