Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fcaf19606e70221…

MALICIOUS

PDF

67.4 KB Created: 2021-09-26 10:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 28b7480e9c8a1583f3a1cbef23597dac SHA-1: dc4d6c68501ac1450625df5faa490b7826f4ee0b SHA-256: 8fcaf19606e70221dfe57cabfb5c889c6e3916c7d13f4fe2fc35f407075e02b9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF exhibits characteristics of a phishing lure, including a small file size and a visual appearance suggesting a screenshot, designed to entice clicks on embedded links. Multiple heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting the PDF's primary purpose is to redirect users to malicious sites for further exploitation. ClamAV detection and ML classification strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 67 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://nomylo.ru/uplcv?utm_term=angels+and+demons+book+pdf PDF link annotation
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/daxogorova.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/sixaw.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/40958245906.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vamuxexigilujikogosura.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/2907751908.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/8356766309.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/majuxikabos.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/natufa.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/66829516502.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/69100770813.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139b7f5aa0d5---20669104442.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/31547461357.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/ruwiwumawabufu.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/pobiluzibazokemuzovav.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/rapanevoxemelole.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/lufipojewasaguwun.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/a2160daf3fa2b5f501d9ea44ac4fc0da/26085911413.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/68366089463.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/ginegakokezamif.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/godarafopudopekamiwumade.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/86137645603.pdfIn PDF document text
    • http://www.thaiticketmajor.com/static/imgUpload/files/66809295618.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_off0000ad0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC522 10764 bytes
SHA-256: 85bf112ce77ba72e9947a25db5bc905fc8677f857db1c27985ee2cf1611e4e11
font_02_sfnt_off0000dd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7D 14140 bytes
SHA-256: f579f4ec08ce96f4f6ce488bf9b71cfc5ae03eca8337e87b72072eb55243a36c

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