Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f642dae3161b890…

MALICIOUS

PDF

89.2 KB Created: 2021-07-16 21:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 132e7fd9a685e6371c0804f3648abd7f SHA-1: 5fdb347017222726208f25d513f19f7c6c96ba94 SHA-256: 5f642dae3161b890a01573b918ecdbc3125f3820dcf6a1b5c533a85ad5694029
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing sites. The document body is unreadable, but the presence of numerous external links strongly implies a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.verimevzabavu.sk/ckfinder/userfiles/files/9016319764.pdf In PDF document text
    • https://damsindia.org/admin/uploads/file/96814281482.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/f2887b43b099571939133dad942cf9c5/didejurikek.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/65783120171.pdfIn PDF document text
    • https://protrialse.eu/files/files/33271930047.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/texefupule.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b58af0bafc896ecec9ab4d9adb3ce92b/8602005156.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/92408092930.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/hqoee4a0dmug93c13t6soss6c1/lokajoziranojabojezamo.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/bf9a7c1735e309ae4c7dae161dbc6a63/turobis.pdfIn PDF document text
    • http://andrewsexes.org/clients/867461/File/fidow.pdfIn PDF document text
    • http://usmleworkout.com/files/file/vedegigajofiwi.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/0fe1a7cb129a884c98a46e698b467352/11227374900.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/158f93d7ab5c5ba555a59b8e3b733f87/lotajukenawoperixalodoloj.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/17210014304.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/55aa0f0227f98b51c3e67fbe08705659/paponuludujiva.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/6985p7t22mffd11ek0r03kr53i/tigonov.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/77ci6b4spgcvrb88irnl3rd6t4/zuwisapesutoreb.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/nu5msffaar3kimpgjdccghg073/89909595700.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991dc006292---57536343539.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/7epjc6jaruuibn4fgnfo6kqq15/xilijegifizozomatodan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=glutinous+in+a+sentencePDF 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_off0000fa0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0C 17684 bytes
SHA-256: a6991f7e766b1263e34d03ae08d06453a490921272346dd070371509e6519106
font_01_sfnt_off0001286e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286E 10260 bytes
SHA-256: cd356bde82cf14bb774ed4683b6ed220407a006914df43c45a1ce84dcd4845e4
font_02_sfnt_off00013fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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