Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6168e013cba269a…

MALICIOUS

PDF

82.1 KB Created: 2021-08-08 16:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aa72ddd8c395829b391958426f6dba33 SHA-1: ae13f5538f7fd910429a3c59467019c054d0b647 SHA-256: f6168e013cba269a73a9e0d4f8a95beb6df2ea82ef6b1f4d5a72544af8d566d2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous URLs that point to other PDFs hosted on compromised WordPress sites. These linked PDFs likely serve as the actual phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/00jgjdee41lg8ej50gudkcpq28/69969926026.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088177a8c0ea---73941430839.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160889b9698a46---52396455271.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/428a1917df859d545222abe366b56814/vuropotavibuwiwivezif.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/35474264998.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608639d598da7---tijivovuba.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/93333232027.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/74058417734.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/jevaka.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/42b25cd59aca345b9197b29a4171eb55/gavoluvaruririmezarafur.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/66191498875.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fb1ca9b08---derev.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/e30421153770d32c01fb76c6c865e18e/78600243850.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/34034998939.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/742b43b21a59db627e6cf651a2f55dc9/24287000864.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/wikuratip.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1623584164.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/11582059448.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83719237b3---39481088908.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/db93e682a7dc4b9886a449f3fd6af32b/lonifesimifajoxawexix.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/89825810018.pdfIn PDF document text
    • http://azizolace.cz/images/file/2914319006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+pair+jbl+endurance+wireless+earbudsPDF 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_off0000da50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA50 17488 bytes
SHA-256: 544b2553a2499c4249bb55b462976ccbc71605c589ea8b28f2d8d0e31e477f5b
font_01_sfnt_off0001085d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12074 10952 bytes
SHA-256: 64fdd5d8726ac840ad2a7421599493606e0ba368a986e94b319162dedf185cbe

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