Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a36e6ce22b67fc…

MALICIOUS

PDF

116.1 KB Created: 2021-07-06 20:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 87f8d4cbe36e689768e87f4e5e5a5ff5 SHA-1: 530ef002f46b067a1b4df8b008d0bd29f2990c02 SHA-256: f9a36e6ce22b67fc885b469dda3eeb4de8ca5a2caac57c03afe2bdd21cb7920d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan payload. While no scripts were directly extracted, the nature of the links suggests a downloader or redirector mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9858

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092584b083a3---pekezazewowugesosemaz.pdf In PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d07b1a628cf---pagefibunatunup.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/act0incfjair3oapmffn6a9tqf/26631230196.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9853c271c---49824968332.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/ijvgkdtfse6ta6gpdjeq690jf0/sirirefosojalog.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb58717519---lorivur.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/42507173599.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/ffaed840dbaaee3df31bbed49bdc89fe/rogorodumet.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/7eecd1b9b467fcf3aafd98a7a0e172a4/wujodifujogoradefusino.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081733381c5a---lukatazawolikal.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/wopidadezuruwejataxa.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d903a2562---xusiminugi.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/838692b67a818d35c25269787b653d03/31792395305.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/xadap.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/zoxagavuvoxesu.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e047fdc6c5b---22539473196.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/dawemam.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfa5cab4fb---46266538700.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/zufebipaxilenitadu.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/57129857002.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/54358228403.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0b87a64c48feb2e9e18f97cf5be4c297/rokomub.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/8e90cdd64922751ec9678cb52f48c485/kemirazibi.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfa1717a59---pedevodedegagen.pdfIn PDF document text
    • http://myredm.ru/uploads/file/sufijok.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/dojuwifowobofewezesugofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=one+mole+of+any+element+has+the+samePDF 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_off00016518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16518 10428 bytes
SHA-256: f8bf82f1472a2c8fdb147c961a910a99cd58d6937210d3e092120f99ad8488ff
font_01_sfnt_off00017c9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000194b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194B0 17496 bytes
SHA-256: 69148243593ed625b8672fd1f0cd62ed2019cab2a3e2f5defa550b6e3a6c8ad0

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