Malicious PDF — malware analysis report

Static analysis result for SHA-256 853445a35336b55d…

MALICIOUS

PDF

86.2 KB Created: 2021-07-09 09:52:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 8c4978a426592d8ba27fb0d241882e50 SHA-1: 97272e8339e1437b67553a3c90193b1dd1e0dcd3 SHA-256: 853445a35336b55d7e5140f7fac52360e0460336e00e6c648678771ec622d994
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating the presence of algorithmically generated URLs and links to compromised CMS upload storage. The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised WordPress installations, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=homonyms+of+read PDF link annotation
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092de95d856c---38904543803.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7biods1nhr94gvv7r9p26j8pmh/parilekevalizomeriv.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/wotigenotupadebiwoduvul.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/17146923707.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/ramefabakubobekimowe.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3157b0bc0f---gesofafedojugurebid.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210627_D939E102D6F7A101.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160afc0599f4a9---goramituxesivikivotabas.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/7032a90fde8bb76222e5c9341f749b90/75398304711.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/1deb4ccb153939d703a9005ca2257304/33133941152.pdfIn PDF document text
    • http://sparkpro.lv/content/file/sonofamafofawitipe.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1a8980cb9---kulagusuvafuzeminuxatine.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/3703720530.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/t4ov9npsr7bhvrjs96c2eb82u7/luvowuxef.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/19a64ebd7f9dc0688e49bb842b054cba/77419773883.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/f186ejsbaqri9bmb6l12gga9nl/15638525622.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be5adb118a9---lawomosol.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f20337b64---gururifejovu.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/ff0d166caf37efe2db3d0ba3582a0fe6/79281091807.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///lepaf.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/9793055572.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/d6038ebe1ec20c98562089f02ecc0dce/27520567580.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/net926amvgfus71dsb1bmn9a6i/fuvetofeninikigasevopulis.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db02b50540---wifepibow.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_off0000f060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF060 10384 bytes
SHA-256: 1f04aea8a019d575c9efb74f5047e91d6961e0dd74345ec3cd8a13df815e7f87
font_01_sfnt_off000107ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE0 16916 bytes
SHA-256: 14d9a512274c9817640cb672012198d3fd2ee1c9662aee28fb8d7c808d29d2ce

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