Malicious PDF — malware analysis report

Static analysis result for SHA-256 825ff2bbe3df0433…

MALICIOUS

PDF

71.3 KB Created: 2021-09-08 11:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 265e2378c8be2c586c39e76ca81d92d8 SHA-1: ba10b4f7bd3a852ade06dfac8edb30e2055fbe9c SHA-256: 825ff2bbe3df043359ea62a568c3e60cfe39d4e6fd3d1ea6f0047b6f9b7013a6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as an image-only lure, typical of phishing campaigns, with multiple links pointing to potentially compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 71 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://almoheetmanpower.com/public_html/userfiles/file/9457795115.pdf In PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/5289528252.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/vejotusonivoretowetuv.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/dikusobo.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/56afa4a231df4d886fbb024cda37ab48/polilijezow.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce4d291cef---detop.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/b603db38c0c408dedb9edec70e7bbce2/72543556178.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/vasukenamafuz.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/pipudakilenub.pdfIn PDF document text
    • https://activepymes.com/pub/file/zoborivobenanabixojemamaz.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ffdc3bc53fb---sepimofosugo.pdfIn PDF document text
    • http://airsoft1.ro/files/file/65878235101.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/zimumipobakafelizupun.pdfIn PDF document text
    • https://flyags.com/editorResources/file///gixaduf.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c698b8c35d8---82764672174.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/6d25a8b71d1c70c897f1372540b2bee5/90148530975.pdfIn PDF document text
    • http://finalbrand.cz/upload/file/guragonotabamejazabulinap.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a867d4406---zagavexibox.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/likoxisodubixebeba.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/96130231926.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083664a0a62b---77823079691.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/zitesatufemujufifiga.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/5359925005.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe13f44366---vovivuvunisej.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161065a20b57d3---90798631655.pdfIn PDF document text
    • http://jessicarossitto.com/clients/7/7c/7c16b8c799dae9ffcd1258f31d6ff645/File/tedoferomovo.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e91428b8af---rixugixedivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=free+printable+scrambled+sentences+worksheetsPDF 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_off0000ba24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA24 14364 bytes
SHA-256: 0f98e97ee144c53cfbe9a550bae0193c44d85b35176e2238efd6983d95ef4b0d
font_01_sfnt_off0000ddb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 11076 bytes
SHA-256: 3ce612b477fceaf98b62ff07452865530bf15d96c943fc56f34bf45c59f597ad
font_02_sfnt_off0000f716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF716 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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