Malicious PDF — malware analysis report

Static analysis result for SHA-256 39568626938b7e9e…

MALICIOUS

PDF

84.5 KB Created: 2021-08-02 14:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 85ca8ddf6044d40c7ccfd163c74e002c SHA-1: 25292ccc2ddb2233bf5410883a2a79f7c51dfca4 SHA-256: 39568626938b7e9ea384ab85f085a84a3e1b25ca73b7d5a49f82e6d9cfba6645
156 Risk Score

Malware Insights

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

This PDF was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/g39kpr33tk45e56gt7hkq34mb6/sufawekuralepapuxuzixor.pdf In PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160884a040af5c---2619489396.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160721df393249---8662015827.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/99778794051.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/sidulatel.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2af314bfb---12969078934.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083aadf05ff8---xejudusekosubiru.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/39347431818.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/83684091456.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f78f5c2ec---22135783523.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/2fmeqihv0m2n8ouuelkif8pm5n/wapogiwusaxa.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/9f8f5cd8c7b45f4821c6f36ca34283c5/dusetelinalamidome.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5675d64ba---33063238515.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c53f7b334---sotedukedumadarexijobozow.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/wutoxadodib.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/67547560568.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/joxuxijujomemabusekumuf.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/79196612118.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/45131897548.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/54370187388.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076dc6964bfa---bipapagavubo.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/064db97c25ce8b854e882a36c499a571/85849302499.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/nerukusokufisiduwoxe.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3bc188048---libidurozexuwujaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=autodesk+bim+360+tutorial+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE325 11328 bytes
SHA-256: c509a79fb26fecd9bcdcc1606385d4f5ce6ea6d46bbd7db7586af0fbab5489cc
font_01_sfnt_off0000fda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA8 17728 bytes
SHA-256: d0d1cbdd046694e1a276fc4bd845e1815accf96a0e795a64871903129cbb4692
font_02_sfnt_off00012c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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