Malicious PDF — malware analysis report

Static analysis result for SHA-256 6826a1a64eab3214…

MALICIOUS

PDF

70.9 KB Created: 2021-09-14 13:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2793a34118b7699f11e0938408999e05 SHA-1: 8cb87fa7b16c809ffc10aeb41d1e417c526fff1d SHA-256: 6826a1a64eab3214846753416c10e7e2b3af62b16bf615d6a44a9e60b783da18
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, several of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on disposable or compromised hosting further supports a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://thsport.dk/userfiles/file/81390398674.pdf In PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/fodimuvuwabitedarujo.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/71850949322.pdfIn PDF document text
    • http://www.toptehnik.si/images/vamegitevejoz.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/24348593406.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613638a2cef39---75714815251.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/5870909158.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a730d4e2dda761cce38ebb2db25a2392/1307412798.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/sekaj.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/lapifimodogozuxadozurexo.pdfIn PDF document text
    • http://runhouchem.com/upload/files/96467592508.pdfIn PDF document text
    • https://pracowniatechart.pl/fckpliki/file/25050745165.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/mexevow.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/62352924719.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/82999571429.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/39145157990.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/53a4b607cd6cd27296f3518b09ff2c51/mojuvudekidasavagex.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/42468046473.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/6286566675.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/gajet.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/94334137397.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d50e896ca---wuzegelibaxuzuwatob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=among+us+new+map+download+androidPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/53421257402.pdfIn PDF document text
    • 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_off0000b67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67B 10804 bytes
SHA-256: 788581e35b4c40152dfa8233fabd04a31a066ff6d21f0b621b43ea8e530920e0
font_01_sfnt_off0000cf30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF30 15312 bytes
SHA-256: a67aff66a6435bcf58364b9d12887f242e08263732000058c94100a14a176fc0
font_02_sfnt_off0000f61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1