Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f687925c36d7e1…

MALICIOUS

PDF

86.1 KB Created: 2021-09-04 11:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-04
MD5: 6f8826f1c3ff99195de2992204f31717 SHA-1: cc15d3b6b3d69043a94b897d9b8b1414322737bd SHA-256: 88f687925c36d7e1e7c1806ea74fb3eb81bb826008bf4e6d45ddab85ae1081da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, designed to trick users into downloading further malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dolnoslaskialarmsmogowy.pl/imgturysta/files/ratuvabudowedimarunido.pdf In PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/5942807235.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c00b3219a---zuziruxanol.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ea824d1ec---20810688475.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/9488577009.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a35e3d97eeb---vafil.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/nalaxanonoxadudenikereso.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/78177044520.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/linejuwopuzuwaza.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/52619831237.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074bcc958bb1---rivujino.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/xaxerovirosalifazebojuber.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8f4a1eb0a---xugiwamatuxu.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/ifsp60daqk0qh2la0tm96oeevq/gubulasas.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/wunuzitazugali.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16072e9ee352ad---47228609267.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/kafugepokusa.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/97876518981.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16070cddcf3250---suvevufexuposusiw.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/kesomesobegipazojemufe.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/gubawudofavopuzotu.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/36507462888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=csir+net+physical+science+notes+pdfPDF 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_off0000e9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DD 18288 bytes
SHA-256: f20474121d952d688561c3f8d7c627a0c1350f42e90b0b1c6472269e9bdc7662
font_01_sfnt_off00011979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11979 10864 bytes
SHA-256: 94024a89c42efa4c6a54ceb99527287edcf4f9288fc0f56c1ba0a28cc48680a6
font_02_sfnt_off00013289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13289 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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