Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1914d6ee25e65c…

MALICIOUS

PDF

74.7 KB Created: 2021-10-04 01:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 53b81dc7002f2c2428b6ec48a737a2e7 SHA-1: 0db4be366d53e88f46a2c2f092f38765b1227d01 SHA-256: 7c1914d6ee25e65cc2ea5a0cfd20db30b0391e99fa7b8cd50b90bae35da63a8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to phish users or lead them to malicious content. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users via a malicious attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://gotoko.com/cmsv2/upload/files/91467102909.pdf In PDF document text
    • http://feldbach-tourismus.at/files/68221424018.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131f653d5154---lavifobebebonepuwolofe.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/simipekenonopuzokunubade.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/66616107571.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/65171374478.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/6172726263.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/59572410600.pdfIn PDF document text
    • http://eternoohydro.com/d/files/nogakipexorofupaxuliruv.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/67614538573.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/prva1glr2ftt7jsb7850dhicu5/42291546125.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/mebukowiri.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/59586867013.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/domes.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/11143244971.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/zewedufoji.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/vogutigodatenufokabag.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/mazupamujogexitodilika.pdfIn PDF document text
    • https://mattress-leader.com/media/16573444806.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/38417737387.pdfIn PDF document text
    • http://keramann.ru/uploads/files/97323971143.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/74272093045.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16159af443aaf5---katofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+rate+of+transpiration+is+measured+byPDF 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_off0000be40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE40 17408 bytes
SHA-256: 571a5f05fdd7751b22bbc58bce58cdf59ba3666544cee2eb73b5796800b05263
font_01_sfnt_off0000eb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4A 11032 bytes
SHA-256: 3627a67f111f2e1c442fe6fd4d3ccbf59da9cb478c9c1486adf38c507cdbeb26
font_02_sfnt_off00010498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1