Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2070ef97fc4902…

MALICIOUS

PDF

96.0 KB Created: 2021-06-26 01:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3ff91c93604a838b7cbf2090c7c17ab6 SHA-1: ebfe6ff46b221d5226b9dd9c14d7dbb1fe6aa690 SHA-256: 5f2070ef97fc4902b8b2d5855550a4c1e543fd451f5ab3a5d45da2438fb011a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=the+order+of+skull+and+bones
    • https://oklogistic.lv/upload/file/53640827874.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/3d9a37bd09ff801af6c804803b848d61/76941356250.pdf
    • http://www.mediagrand.hu//data/editorfile/32318377966.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/kt7ljbuco4fqehp9hel5kh4ns9/pisufisalabakodawunegid.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/444133ce00d8b7050aed6bfe24c4fc0f/fumekujozasoxaraki.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/58022efc2cb88d2a1bf24179a96c2551/panukeni.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/stujha47b0btmp93tqt7hm007n/14410012013.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8facecbbd4---71411689062.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68b654370---60150723856.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/o4edo019542ic0ukct0pc52g2l/xijituze.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada2e970571---37224086520.pdf
    • http://mosvag.ru/img/lib/file/66478777677.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/e46d239a18b26e462a4d70824f171ad1/vupotaloro.pdf
    • http://novussiteyonetimi.com/uploads/file/36680960016.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/bpnnq9lve5ll1h6kdjtho5p0mj/6062333717.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4e5279c47---zidar.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/hljk2c3i5vh083tsv6jjc6jga4/rojopulogatomowunuluvaja.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5a86efb85---famuduvowilijabepirujadab.pdf
    • http://stlnsk.ru/uploads/file/kaximizuweposeso.pdf
    • http://accronline.com/userfiles/file/52336523864.pdf
    • http://skiflogistics.ru/userfiles/file/50560233628.pdf
    • https://ehotelgateway.com/bot/ckfinder/uf/files/9927202156.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7592b12f7f---mefuxogaxi.pdf
    • http://mayinluatudong.com/uploads/userfiles/file/96750933513.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011432.bin
14a7d799028312b7861e2bc2f4b69d29bb3b6f3f782649ac953359926b8436e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11432 18044 bytes
font_01_sfnt_off00014391.bin
77fcf7d11d3453fc7d249b7c9994415675110c6a35dc30caf0f5cb44c72667ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x14391 10556 bytes
font_02_sfnt_off00015b99.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B99 16792 bytes