Malicious PDF — malware analysis report

Static analysis result for SHA-256 047b52a07eeb6968…

MALICIOUS

PDF

74.6 KB Created: 2021-09-07 08:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b6984260b692097c346f40a5607b8dd1 SHA-1: 0447b6933225a6bf2a4eea86a30f0ec78b338aa1 SHA-256: 047b52a07eeb69684c4d02cf69d9173c358299737a85825f07767f92d08c0ff6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_CALLBACK_LURE' strongly suggests the document is designed to trick users into calling a phone number for fraudulent purposes, consistent with callback phishing or tech-support scams. Numerous external URLs were extracted, many pointing to disposable hosting or compromised CMS uploads, likely serving as lures or hosting secondary payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://garglob.ru/uplcv?utm_term=interactive+learning+systems+evaluation+pdf PDF link annotation
    • https://delcinfo.ru/img/files/files/52237722206.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/djsufosm4thjrj2jnpadvs6tm1/93109932474.pdfIn PDF document text
    • http://northcity.rs/slike/files/7211890795.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tapt5np6jpl0kil8clg29nmer6/jokofew.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/86461839364.pdfIn PDF document text
    • https://togeltop.net/contents//files/77905251692.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ae77d7befff---49923138911.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/70146204513.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/27787995698.pdfIn PDF document text
    • http://findplusltd.com/file/60663744409.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/bitetogatexare.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ae66c707f878eac702217d3beb5ec1ca/darobunakezasimide.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/bunokirunixinawogi.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/vomitivesedi.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/kalew.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fed2377cf---8794884948.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/tagotetijugubezod.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925fac94de7---bivanokupusatejid.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/sibodiwadagewagegemus.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/kosedejut.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/josaxo.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/9cfe9ab2ff47b58362e3bf70082f8a92/18967966623.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/6h8mdltqf8ltr1l38e5rr5l1rh/26008574628.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_off0000bf0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0C 11192 bytes
SHA-256: e932fff229a09005853e790c80e1aad70f7df164aefcab3c2dd89d936be261ca
font_01_sfnt_off0000d919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 16712 bytes
SHA-256: 8d3dba22862317a1c9c7d6b49431c6f294c1c14648ea585499db01933c30dc25

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