Malicious PDF — malware analysis report

Static analysis result for SHA-256 8660e215362537eb…

MALICIOUS

PDF

68.3 KB Created: 2021-09-06 02:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1239a1300b806ed5d3cfac189a94c702 SHA-1: 27b5b36a4932556eff34ecec27e13c3c69148a7b SHA-256: 8660e215362537eb3887b6a026c92e857a7b76d333cb060c484b417056396b99
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot designed to trick users into clicking links. The heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting the document's primary purpose is to redirect users to malicious sites. No specific family was identified, but the techniques used are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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 68 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://theclubburger.com/uploads/files/92932116798.pdf In PDF document text
    • https://simorgh.it/uploads/file/rubuvojegofebatoxutixaj.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/42688338441.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/zesozibur.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609772dc07185---7855996460.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ac5b2ab20---61050714439.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/jotaxav.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed1ed0259b2---davur.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a83b8511b03---66599776727.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/sagelaxozamemaketonimap.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/9a4b7b826c79c1c27af9a76896066a0f/jonapaveriferadekomenow.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/darosupinedujokazumirobe.pdfIn PDF document text
    • https://nepalonlineexam.tisaracademy.com/userfiles/files/dokelopejotulemokopodexo.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/wejojuduk.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/312a2350f148c0395b04eb14844f4af1/51263794644.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/50853269822.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/7vqtbdev6ccocnfs5j056qq7p3/65258624010.pdfIn PDF document text
    • https://actorconseil.com/files/file/leputevav.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/wuvuruxubulaxazuwinopeda.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/wimerurujesozudolo.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/2050512437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=exact+differential+equation+example+problems+with+solutions+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_off0000ad4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55D 13752 bytes
SHA-256: 44a2bce34241037caf87432f3d45f1b95952873364e2df07bca5632fefb6ddbd
font_02_sfnt_off0000e6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E5 11440 bytes
SHA-256: 1a103540eb94f0d73ac5800b7a96fdc8d7924866be4972d0db0dec3cb71aeeff

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