Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c46b27ae2572df…

MALICIOUS

PDF

82.4 KB Created: 2021-09-05 21:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6cd2bc694b5b48eddae1759074befa0b SHA-1: 52d797d1a4e723e79d0327ae92646ba7bec82a38 SHA-256: e6c46b27ae2572df2922e97a61999a5c7a398da6dd0da16f109411bb7112c20a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The primary attack pattern involves directing users to external, potentially compromised, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://commsoft.nu/demo/ktb/wsmbilder/files/61529841820.pdf In PDF document text
    • http://schubert-hh.de/image/file/savuga.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/86711156950.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lifexifezazukuwu.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160940d8352e7c---dufepudulu.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/21257036775.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/xerolexufetuxekezaduni.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/30279208537.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/cd172069cbdf67c3b8b1742a150d6fd7/toxeganoxokekap.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/79bf1a92c78922984618cca3d92c3017/63057610421.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e6e3ab585d---93515898289.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/76764542286.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610c272c4a068---xezigapokobesexevabegaxem.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/53933895182.pdfIn PDF document text
    • http://tfforming.ru/d/files/72131179312.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/diveverebax.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/modaguseminesoboxepizuj.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/14760737108.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2549a36f4f---sadatelejotejodi.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/92942204504.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/3438528623.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a950cec35f9---89656739026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=dictionary+english+arabic+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_off0000da6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 11156 bytes
SHA-256: 260ed5388a46b5303805e875882fec49b1bd87bd14fb55aa567eda1c9793e937
font_02_sfnt_off00010c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1C 18528 bytes
SHA-256: 49b2aa33005a01b85adce2bd2e3baae443b2f4a2fd423b37b2b7ada837c2c7b5

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