Malicious PDF — malware analysis report

Static analysis result for SHA-256 3666675ff5cfc172…

MALICIOUS

PDF

90.3 KB Created: 2021-07-15 13:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7750ba50802019218d0e949c0237157c SHA-1: c1bffcf9203f41f9907735cb4d84380bfaaf71d8 SHA-256: 3666675ff5cfc172db6d027bc8a2470b970c4f45cad99973ba5fbcabcd168bb2
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF link farm indicators suggests an attempt to direct users to malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://engroupe.ca/aym_image/files/54318347740.pdf In PDF document text
    • http://lulanjina.net/upload/files/15974929117.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/xoliwudekinoguzixona.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/dopaxize.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/1b24bf6c1348916acb69169aae1808c8/22413703530.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/zaroturukumijenava.pdfIn PDF document text
    • http://skupka23.ru/upload/m/buwolegefupafoful.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/324773031.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/22978988016.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/30692814451.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/dorosemeze.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/xuxabisepizejakawu.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160e9106432361---13028344692.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/jigetufazegogadolatifiwo.pdfIn PDF document text
    • https://bloomeng.com/uploads/17098864012.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/m4sela2ggo8b4g34ef0vj8joph/4140598981.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/3so2dgsohc50go1nfjaq761bks/magazimupelineni.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160990f38bbd2a---ranuwunu.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/xifakawikexepij.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/6334798313.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/c319dmkosj2htok3qofm56s4c3/fisodivukojupilira.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/62191456442.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0606729a6ae35fa5695a5ad75a8dcd07/wuzinireseketawafu.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/b6a77f8ebbf32cd9228899d7a6c727c3/42199079919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=heaviest+domestic+cat+in+the+worldPDF 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_off0000fcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD0 17552 bytes
SHA-256: 4470c2335fa0fe4342af07546b9f3450ec170a7753682194efb5fffc89ba1b2e
font_01_sfnt_off00012ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE0 10780 bytes
SHA-256: f6aa63bd3e4ccabe490ca3cb69f4df053e89de097959de2ac8d32e78b7576bff
font_02_sfnt_off00014382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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