Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c8ac4fd6ff404e…

MALICIOUS

PDF

88.8 KB Created: 2021-09-05 16:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: adef783a516f4da1ae002b642acd7e40 SHA-1: c5d857f20a3633d23a716b7e763131062ea103b1 SHA-256: 80c8ac4fd6ff404e9203cc51e3d5b9a78227a3e8a14085a96c5c54e79f34db57
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The embedded URLs and link farm structure indicate an attempt to deliver a secondary payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/jokapisid.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a07ae8018f3---vesejuv.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/xijogapologadorukedaraf.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/pupejovudu.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/8q0arpi3eugl9neaehhqk8glq9/vafapelam.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088ecb25dd0d---sibarar.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/wexixeder.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/6icdn6s42rdpl78eicer79r7io/rebekowozunofofunupowoze.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///dimewanuzugi.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/wivoreselusopesadu.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606e61607ac2c---supawewewepamutizejox.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/43306682969.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/dd1e8b5f065ae7acea4fa1568b3488fe/xipobevonuwaluwilemenegif.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/53785377503.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/177c0ba9c4cbad92fbd49da0c5d8a8b6/wusegifojogatod.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/rofixal.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613440c15429d---xelugesagoxoluzeluti.pdfIn PDF document text
    • https://strechybenesov.cz/content/21695582739.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608252b772cf6---37670807370.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607079b810f7a---9426011326.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/feb05998b0fcaab74ac2d71f8a4d6c42/sokadesug.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/xegepizu.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607729ee77910---satanozelolev.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/xenipet.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/pebinodugiwevuwirelagino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=horizontal+analysis+of+balance+sheet+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_off0000f1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E5 18624 bytes
SHA-256: e87762e9b23ad976ff65ee2214e28be0ad2ffcdda73463de86242b080f423a1c
font_01_sfnt_off00012220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A37 11024 bytes
SHA-256: 376c1e00a4b8bf5fcf18db1ef26dafaf20d18aac67a49b3a4f1d151b3c9165bb

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