Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1e1acaeaf11bac…

MALICIOUS

PDF

80.4 KB Created: 2021-06-28 16:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 156182e54077be4a6d90429d423ce0c9 SHA-1: 77f5b1d31fb8d00fb4700159911ce2aecef49114 SHA-256: 4a1e1acaeaf11bac0589c2611435e185b7aa1e3590fd85b1d44fc6defe37abaa
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. These links are likely intended to redirect users to malicious content or phishing sites, aligning with a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://balbok.net/admin/ckfinder/userfiles/files/satowus.pdf In PDF document text
    • http://yaqeen-eg.com/userfiles/file/kesutefexo.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/llein5frordis6ipv342qbt7hr/varus.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/juvewibupumaxotadepuxa.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5d3bd5bfe---29429575635.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/lemovero.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081914a41965---damuxezef.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/mejatomovasenumaneb.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f75651ef2---lidojawenusixitu.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/b2ac7bcb57044830ef5c028ce85c7104/58299962863.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca841d8c10---61630197447.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/77631529516.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/1011104850.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29c1248da6---74389553502.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/44524040146.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf46a21743---kamenupidetoxabij.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/9c0e9f5eda7df059c0dab6c15ce4328d/kazetanovupug.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609adb21d6082---wujamixiwidataxuk.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/90143009987.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/86791035193.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/fl726h7a5866p95rf7l8p7f6f6/2221340440.pdfIn PDF document text
    • http://adbuffalony.com/uploads/files/10890592744.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160753a782a6cd---40345829303.pdfIn PDF document text
    • http://jfe.hk/userfiles/dikumeronaduka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=bollywood+songs+on+piano+for+beginnersPDF 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_off0000d674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD674 10968 bytes
SHA-256: f706077eb6d7812ca6c282cab07b03d545148b542d6e9da7fd2a4ad2e7960940
font_01_sfnt_off0000efa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B7 17212 bytes
SHA-256: fd743ee21a27c2a99de641626f14c53dcc4d3df708e2ccc5cb39e006ba5ad14f