Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b5052748aa1494…

MALICIOUS

PDF

98.4 KB Created: 2021-09-08 18:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87c3684345a50faea160fca10b3d4857 SHA-1: fe87e7d8bee676420b01ea2888331a2126c3bf83 SHA-256: 08b5052748aa1494968bf138de3ffab21df0482551ecb47f54fbb6d23f6cf1df
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to numerous websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a phishing or malware distribution attempt. The presence of external URIs and link farm characteristics strongly suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61611779824.pdf In PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/b02udpfn96np7kaej9v7fb9f3h/33937711411.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/popopol.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/23099997500.pdfIn PDF document text
    • https://tempegaring.com/contents/files/vusevosodadewatisiko.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ltpc9jl12b50hotm8k9ps37d0g/13771508193.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/34849224101.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/34979258335.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/25936556038.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/80f3d8c98725dfdb6ce2f274ee5ed58a/34558590523.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/sodujilorusik.pdfIn PDF document text
    • http://a-pluset.com/userfiles/lepojodidolipetozaxifuv.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/5mdqs6t4lqmdq8qp2di3oaegd2/88244219360.pdfIn PDF document text
    • http://4rrecycle.com/files/file/76025367844.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/witeferuxe.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/guriruwota.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/surirerapejafolapu.pdfIn PDF document text
    • https://kaimano.it/file/66999402267.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/70738871954.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/birujibunun.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///10701029412.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-6/20210906022514211008.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/66283700008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=y%C3%BCz%C3%BCklerin+efendisi+ingilizce+kitap+pdfPDF 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_off00011923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13135 18664 bytes
SHA-256: 2a5371f61010681ce7e9b7b46778c3486c8e211a6b7564c5a4a22da44c988431
font_02_sfnt_off0001601a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1601A 11000 bytes
SHA-256: 05a2dcc55c7220aa5154b33bc2c5da911196b93b3c58a8d23424915d846480f5