Malicious PDF — malware analysis report

Static analysis result for SHA-256 814d6971902b623e…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 21:12:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 41cd3737f841e6bad1b8fd5a09cc7d70 SHA-1: bc1e14ac2708b8815954c6cc3042b1a8ae5ac080 SHA-256: 814d6971902b623e6e8f7bbe6398e7ba563fb1eaf3f37f8bec3b68be40e6f6e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves luring users through a malicious attachment to a site that further redirects them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://tiquital.com/documentos/file/kanapopagedaget.pdf In PDF document text
    • http://kruengrangthai.com/files/files/xofewijowef.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/76088509459.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/32058588619.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/5buscpe4pfpknqjf4dkbb1urpt/xojodupevajufitorobop.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/bonufezeretamudex.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/muzabebinizegifurugezub.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/28196569372.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/gegivoxukilidebiwiz.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/24908750452.pdfIn PDF document text
    • https://parfumzone.ro/files/file/42387827065.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/91881497818.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/38014f345ee2d799e3c82ba89eeff6ec/26080341850.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/42ae1322c65ad8e71ababb01da7ba216/22989079847.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/wifanekuno.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/zobojoditi.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/zutagubikigovirevapolatuf.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/49154224269.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/057dab07257ea181343df4cf320d1678/35333815293.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/finet.pdfIn PDF document text
    • http://szm.hu/userfiles/file/refedujunewatejalozepi.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/mazob.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/terukosuvarujojudidebuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pdf+compressor+mac+os+xPDF 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_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 10544 bytes
SHA-256: a026c4ca764792ffedf27f325d520f84060e983ce9e0db3a13843888619190c2
font_01_sfnt_off0000f55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6E 18184 bytes
SHA-256: ba774e883897e13d81ea4221d4ae06462a1ac855a4fb64eaae8896420f34dfc3

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