Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6526079159c6ca…

MALICIOUS

PDF

90.8 KB Created: 2021-06-29 01:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 60091a013f24ea6d8709bbab5a22a720 SHA-1: 8fce819f3018bcc6f0ebfc59e3aa1b2d0ae2006f SHA-256: 4f6526079159c6ca37a36d51fd3d2e6df9280d2d1cbdb884fe12dc02f3aaad23
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URIs pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The primary function seems to be redirecting users to these external sites, likely to deliver a secondary payload or conduct phishing. No scripts were extracted, but the PDF structure and numerous external links suggest a malicious intent to lead the user away from the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://queure.ru/uplcv?utm_term=hill+climb+unlimited+coins+and+gems
    • http://altelaw.com/uploads/image/file/nuvemotutazexetatovamu.pdf
    • http://szao-spb.ru/images/news/file/jelunumasexesomuzuv.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/f3adb1343667b4eec4f2780da74d2e01/96506094031.pdf
    • http://sochi-polyana.com/ckfinder/userfiles/files/kulixizolib.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/25400a3fe83c8d3c3199da42931a17fd/dinarapajiredo.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16072afc95f157---zadinupizimuwesawo.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160852d5462eb9---devudigobulepif.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/l3ou2v82l0hhmbt30pcs7f70ta/pazarurirujanutagono.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/3u32aqgdqs13v01use8mhhps07/34783187838.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d450e95b7086942b0e7f47600c275534/fulavukutixogegozu.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/dsndh7moq668fdgd6knea0ooqv/96027121209.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607725e56d483---24037750583.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/81479c0fab07f6a056ca41a1c49bffa1/wowetigutusigetupugep.pdf
    • https://kawanmto.net/contents//files/37317673003.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd1f53d8a5---jepexogogumilafusulirubo.pdf
    • https://diedacorporation.net/freesiafiles/file/50425967289.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/518aaa4f53bfc6ea4bb5d004d9af26de/torogotorawatefawe.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/b5c7ca82a5ebc40e704463c67876bf3f/81145571437.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/44c8nco2vm49pe0jvugffh35jg/73349525772.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a99fe245922---76682302747.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/rvpf60edlgvqi99233uob5jeac/754385356.pdf
    • https://bajrahrs.com/userfiles/file/9368341724.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/5f46e3d6bc9211514ba94db3a300aa22/fokoxaxikovuposudakinabe.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd8cd3be3b---85489723997.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e863.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE863 16792 bytes
font_01_sfnt_off00010075.bin
ac89eb4fcf6f7c6b906c1b61a196fef37889f917d1bd67253d5e26a9cc19b35f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 17812 bytes
font_02_sfnt_off00012f64.bin
74ea40c6abafff908ba0a862ebf25ee1d47d31f530ca964bdc695191fb21b084		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F64 16116 bytes
font_03_sfnt_off000144bd.bin
6f8f8e7ea1ad76074b55d16c544af7ad2c00f1a6cdc6ca5d8e4a090048bcf2e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x144BD 10844 bytes

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