Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1d38f10f294b3e…

MALICIOUS

PDF

69.6 KB Created: 2021-09-17 01:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a850903ee1ec4900353b0e0b4f2227b7 SHA-1: 16d22d3409e1ba13aabaab21acd56a9a327e6e67 SHA-256: fa1d38f10f294b3e76c145898fcfb9067cf6b790f8cbd5a7cdb54e202fb5b2b4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF exhibits characteristics of a phishing lure, including being image-heavy with a click-outward action and containing numerous embedded links to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and numerous external links suggest the PDF is intended to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://crysiq.ru/uplcv?utm_term=free+6lack+album+zip+download PDF link annotation
    • http://modulobase.com/userfiles/file/tinesidemusizijato.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/topazudasowagavokopatimif.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/xuwile.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/43679393748.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/varawogiwefedivegaj.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/61647472756.pdfIn PDF document text
    • https://la-klamm.org/Files/files/68316293880.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/39776442542.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/91145680035.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210914052010.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/e1048da7243831bc5b39b47b509b9f57/49006531843.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/f2175ed6c8ce890cb6e6b53237f1dbb5/sogafe.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/19335480460.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161393ee0766c7---82719545144.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/hpbc43khgmujgf2ui9polrigfr/posas.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/39635189356.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/ruzuxegalumuvugalesim.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/13855310982.pdfIn PDF document text
    • http://storemisr.com/uploads/files/rorozanisanezoronim.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/zipesadelu.pdfIn PDF document text
    • http://newbiiz.com/upfiles/file/81899749993.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/lovija.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/zafujova.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_off0000b202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA19 11032 bytes
SHA-256: 3446c9bece388d1e0c1db70f0993beeb0b89686f6c272481185c553cc56e4d2d
font_02_sfnt_off0000e38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38D 14276 bytes
SHA-256: 519ca02347b6e555249d86f1530245481cb2e3158ea947772eab8121fb385ca3

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