Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1f734a26911c48…

MALICIOUS

PDF

81.8 KB Created: 2021-07-06 02:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6a2d2b4b4dedb10d7fbff2c611849a52 SHA-1: 52d1fc58bb5a4926c0c28acf5c90dc14981be8d5 SHA-256: df1f734a26911c48b72be235955518dacf6b59fa25b0b5200dee87b3e2d27d1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a large number of links, many of which point to compromised WordPress sites. The ClamAV detection indicates it is a phishing or trojan. The PDF structure and link farm behavior suggest it is designed to lure users to malicious sites, potentially for credential harvesting or further malware delivery. No scripts were extracted, but the PDF's nature implies it relies on user interaction to navigate to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4700

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=rock+of+ice PDF link annotation
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbc194ed93---jinuwikenejiv.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/1kt2ccdvga1vj5ud0lvrfp4qq4/sasaxoxedefarow.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/pirepag.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c39hsf5s52cgat8l8mt7qvefn/varomonutoforejataxujaga.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/9330257630.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/638bc9212328dd366b468670ee059707/xukuxinonerekubutikusosow.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607abd8352ee2---resufimimepazuzapuno.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/e5b8c2fc93a481e8bf897c502b8553a0/34284689558.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/mukopazarix.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/c1a9ffb4581f14623e22733eeceebd74/29322797345.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5283e963bc---wagajugoweb.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/32es2b8r21o9fvuu29dsd76kr5/xetifa.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e691b3f2a---74556494529.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ee8861b29---87949216415.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/doluv.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/zalisogejodutunali.pdfIn PDF document text
    • http://metapolar.hu/tmp/xupukebinuguwafadami.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/fe05c6c5e4f60028d433589f9a1d536d/begevopiwajusu.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/94660471181.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/589ba03388915dc28c0da63c7ee1be29/daxiniludikogazi.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210528171639.pdfIn PDF document text
    • https://tonitomov.com/picture/file/34471757497.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9c8505e79---32557180741.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/747b4ae2f475f61fd606877357745796/34751935644.pdfIn 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_off0000e9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CB 9788 bytes
SHA-256: 5d3f5e9a66543bbb2cd040764e5df317e02a45ab313ca58f91c53d02ebc75d9c
font_02_sfnt_off00011756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11756 16620 bytes
SHA-256: 9fa800ff32218773a4c451a8f620b01add2568d38899bc87c893165adc82ab31

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