Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed99ac8016cb8f67…

MALICIOUS

PDF

88.9 KB Created: 2021-08-13 03:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 02e5aec0e6c39da686ff3e2c81fe7117 SHA-1: 1613297c59afadc2357b938aa479b09995a8717e SHA-256: ed99ac8016cb8f67cfbbbf377929aadbba00d3aac46b7cc182b9111e01ec4e25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple compromised WordPress sites, which in turn host other PDFs. This behavior is indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure suggests a spearphishing attachment used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094582b18314---xotizizikapa.pdf In PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f97d0497e60---27934250538.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607070108f691---54402419400.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc7fd5ac490---doterenubeloz.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/f77e51d1943c17df22ebba900e266a39/bofabazexunusomute.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/82455710684.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/94288287212.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160dcdeb66430a---78658333274.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1e4193d1c---wafira.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609830066d1a0---xexel.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5e5c22641---10632496233.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/12395441183.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/porawemonugojomapefus.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021062517381821.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/de4dc89182a822b053d7950bfd8537e8/54381829030.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/53146140648.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/sijuxedexujam.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ltap184ls20h0finppkblic8a6/xofebozivalugejeru.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/849c6fd5b8cd159cd58bbf2a1685ca6e/68310923172.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/56257980873.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af8470eab8---lageki.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/599c2778503cd3f6486e19e31e22b71e/woganuzijuvupoxaruzemagej.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/3ed3d75959a47774ce5315845c9b9738/vesusasikujitazagof.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/sagidirezasotix.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/on7fgah483g0nvqu4598qkcrtc/15594199664.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/kususeveto.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///8775817477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=monkey+clicker+legends+codesPDF 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_off0000f54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 17764 bytes
SHA-256: 35f724192ca0ee4ba955721f284b9b133b4205a096f58b5f29701531a07480a9
font_01_sfnt_off00012415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12415 10484 bytes
SHA-256: d4f0f92581591efb34bd955c7558185be4ee9a65fab453dc2c1aecb25f4362f3
font_02_sfnt_off00013bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1