Malicious PDF — malware analysis report

Static analysis result for SHA-256 0786e355e90283c5…

MALICIOUS

PDF

69.0 KB Created: 2021-09-27 16:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 60b2ab37c116c391d1dce8f742c970ec SHA-1: b2ceabd7ab7f40ac025e2fbc98d4f5ef87a62478 SHA-256: 0786e355e90283c56580c7550412a9cfa74605ad0f8c843ec67ba401f72e0c39
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, employing an image-based design to conceal clickable links. Heuristics indicate it's an image-only document with action triggers, typical of a screenshot lure. The numerous embedded URLs, many pointing to compromised WordPress uploads and disposable hosting, suggest a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 2 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.
  • 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://catamma.ru/uplcv?utm_term=contacts+on+sim+card+not+showing+on+android PDF link annotation
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/2eb429c2059cbf1358eb513870a83089/xusoragulas.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11773509697.pdfIn PDF document text
    • http://runhouchem.com/upload/files/73527242934.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/32497877469.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/80934295441.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/81291599812.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/22903772101.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/1f4d6bc902e4bb5001218a3b6c4206a6/lonowe.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/be826af15d3fc5e906bbd32aa7200dd7/nunowijabuxixujo.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/56000502390.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/59974337824.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/96670731272.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/kaxogosiv.pdfIn PDF document text
    • http://www.edgartownschool.net/uploads/files/26918495323.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/xutofivewujatufar.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210926054141_aplt73.pdfIn PDF document text
    • http://keacg.com/upload/files/27561788370.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/rewikegenaj.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/39679097919.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/wuxezukopa.pdfIn PDF document text
    • http://emannsltd.com/userfiles/17758101218.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/81811370474.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/witaneritameloba.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_off0000b114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB114 14472 bytes
SHA-256: b1ed20e4d6304321b6361a18dee5002fa277dc9062a8fcc161a775c1c8f0c3a3
font_01_sfnt_off0000d55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED72 10756 bytes
SHA-256: 139806e29335d0fef0b263d2f2f16526e2af4a0fe851d11d4c4c36a91993a3d1

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