Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cbd88d39309f83f…

MALICIOUS

PDF

136.7 KB Created: 2021-07-03 22:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7f133ae8a01c54044bb1d5b0af83b529 SHA-1: 2704221fe3d59d39d5818696c3b95db89e5899b8 SHA-256: 7cbd88d39309f83f0971f36ad1b206ee1b1991fe1fd71a2cbccfc4d195dc1c04
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or deliver further malware. The embedded URLs are designed to lure users into clicking on links that lead to potentially compromised content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/bf613edc05e5bde819099813f42e8aad/tikilajum.pdf In PDF document text
    • http://teplolux72.ru/upload/file/15726241108.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/5853632551.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/8212040022.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ea2ac50ccbb314af8cd7b6f828e279e6/repulaxikije.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/27840935369.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/51090105806.pdfIn PDF document text
    • http://keacg.com/upload/files/81345557160.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/2eeea9bee28d9b7d3a71963c380b9f1b/sufosudetixegukemamuraf.pdfIn PDF document text
    • http://xycrusher.com/d/files/wikagakewubu.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/6ceb5d96b8979f2f2c4237943fa50c59/12895728411.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/d7934bfded8b5a568711801cf7450fe4/54260722438.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/wasetobojejugawigewatupil.pdfIn PDF document text
    • http://delve-cr.com/uploads/10079997531.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/godasaganorugakuraxejeka.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/af2764b866dc47d75e647dec6382207a/nabewus.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc5a1bd781---87439990879.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/69269f77e6415c32cb99bfabd47fb1a5/23912438764.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/migoxu.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/1g88aauopbndkjc8bjhr6l1cd6/gotowepekegukapabemuje.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/o822kihftselouhb7d1sje2365/nofefolet.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/62746430868.pdfIn PDF document text
    • https://fishboat.hr/files/wimasejesef.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16097472004d78---54678403186.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/81b63ba07f2c58806faecf91996f7cb1/pilopitadalikekidebig.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/df9ed60a9cd7b11480bf34f16ebad96e/kinofaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+another+word+for+homeostasisPDF 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_off0001b46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B46A 10652 bytes
SHA-256: 627a18ffcd5d4954dc61c47ad65c559adc290d46d916ce1568ae1c15fea6eb52
font_01_sfnt_off0001ccb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCB2 19200 bytes
SHA-256: 054e5d2fa2526995d67de5883aed2bcd6fad3d868fbba9947e7e004e6f526b9c
font_02_sfnt_off0001fcd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FCD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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