Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff48e04efdde4b9…

MALICIOUS

PDF

73.9 KB Created: 2021-09-17 12:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5dfefafea7c61e21aa944f4df49be138 SHA-1: 401852fe31f28312c04da7c0f8c75e3b68dd3010 SHA-256: 2ff48e04efdde4b91bbc9e385d90c98273734d9397aeddec82cf5a5b282a15dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of non-clustered links on disposable hosting, suggesting an attempt to manipulate search engine results or distribute malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The embedded URLs likely serve as lures for users to download further malicious payloads or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=download+wibr%2B+wifi+bruteforce+hack+apk PDF link annotation
    • http://kondicionery-noginsk.ru/upload_picture/file/dozofukid.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/mamuloginunewagetepavalas.pdfIn PDF document text
    • http://skncn.com/u/files/gamufavefeb.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/82315299430.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/60325412045.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/pizaxezili.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/fenagatevobig.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/gunisozuriwonokevodu.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16141c8b95a695---nigabegesokopipisajimevag.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/69904524056.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f56d8698b64af8d26ff41cb8d5a9f707/tegabiwaruvevukinemexete.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/fuj0k371us3bm4hh0kmnuiaglq/72698122431.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/80791893636.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/77644609266.pdfIn PDF document text
    • http://ustunongel.com/image/files/71218496758.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/48826816334.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/dipuni.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210908121407_93218929.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/31404903320.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/5028896804.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142fca994b07---dafere.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/27536984848.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/70211604412.pdfIn PDF document text
    • http://espokebar.com/uploads/files/fufezofota.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_off0000bc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC16 10968 bytes
SHA-256: fbb203566dbbc5c37a643d305db870edc834856079c8b5765775d0a5f0b3d834
font_01_sfnt_off0000d54a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5C 17256 bytes
SHA-256: cfc21f8b9ab4f4e8e007d49d4f15e9c72188a8b2f346922d4f980c9da3637c1a