Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39d7bd91946907d…

MALICIOUS

PDF

84.6 KB Created: 2021-08-02 07:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: c36dfab77707fbcedd3172506d2252ff SHA-1: 01e23a896b6f7f8d4d9db0929f5f6162c841cacc SHA-256: a39d7bd91946907d12796c57dd71994d8bdbb9c74a05724270441c3697bb8c5d
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or exploit vulnerabilities. The heuristic firings indicate it functions as a link farm, pointing to numerous compromised domains and disposable hosting sites, likely for phishing or SEO abuse. The ML classifier and ClamAV detection strongly suggest malicious intent, with the embedded JavaScript likely facilitating the redirection to these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=how+to+write+letter+to+disconnect+internet+connection PDF link annotation
    • http://polskienarty.pl/data/aktualnosci_imgs/file/rufedobirelafeloz.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c7ecbaff7---54996476182.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/ctc29t1biorg6615vcp3n56ru3/xazexolesemafikudizi.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/18868988409.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2747654e71---rirudem.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff24be415b---butofojoribijanete.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/6b89c5d9ce1a2c5e8e1a9ac65bed32e8/zaxasasewazomomatorizujej.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/76497245288.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/t3vjdfcfu6784jlfp1hs1ecibq/fimusuridopogad.pdfIn PDF document text
    • https://subarini.ro/mm/file/19145033423.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/2a09fc2e84137cf99c90735822751c74/39164362959.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2809834c6a---30397227853.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/8082556305.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/aa0c0a8d68a7819cb4a0e3be05e3bbba/56333389762.pdfIn PDF document text
    • https://hiroyoung.com/data/files/45707780501.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/punoxuzenivimutudef.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/32611645256.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/51f58f5307dba9bcd1aac30ba9b5c479/nezobirikifuwatomo.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/53507010072.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/cddbca808085d72b4ce4018d3da0607d/49257595202.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/a0bc1d48f2e25590d0b9cd8a72ae36e2/nonalamafutekonimik.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/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_off0000ebf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10407 10280 bytes
SHA-256: 3943f0ef04f678a0976ff28f21071f3d971ca1ba68c328622d5890e7afadeb09
font_02_sfnt_off00011b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B42 16960 bytes
SHA-256: d4b99385e7e47ea4b3adf4e7977a43e06773972f572afb8beb38548136ec1866

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