Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf35d9ab2144dff4…

MALICIOUS

PDF

84.4 KB Created: 2021-07-09 01:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f9890fceec2d89aa3a976a9600d4ea9 SHA-1: 49eb779ef5952eb2f4bc261685034064e2d02704 SHA-256: bf35d9ab2144dff4538ff5a9f18b43d1fedaf17dd056f6fe1c86e5d738242be5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. These links are likely designed to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/pvjjfqvffqqup05jk2lkljbrja/19629925407.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/9b70cba024ec7052a8363c972a8df8ed/10616609709.pdf
    • https://ksuskalology.com/images/file/rajemenera.pdf
    • http://adance0112.com/upfile/editor/file/baxisepuguku.pdf
    • http://asja-doll.ru/userfiles/file/dixukasigaxajutazama.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981dc17de1c---kemutezubiderupakuradib.pdf
    • http://wanyuantemple.tw/userfiles/file/jelabejalu.pdf
    • http://centronegozi.com/public/73361389721.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/15db62fd41be0ac3992314562fa1227a/38160865943.pdf
    • https://acronimocostanzo.com/userfiles/file/22202353198.pdf
    • https://a2designbg.com/userfiles/file/kepamobesekumepeberore.pdf
    • http://cyuanmei.com/userfiles/file/davez.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/804094cb7d343b404bf26d48832194b5/rolikixijezevoxafuw.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db24902b796---72271903631.pdf
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/33161520833.pdf
    • https://abofahed.com/userfiles/file/57126963678.pdf
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/99369012528.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a30bbf301---bilopawejewarozofabik.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/f64d2e0254138e4ecc97d8c69408633e/gejefojadavojobu.pdf
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/xiwavuxijuzipugedovu.pdf
    • http://openendrep.com/userfiles/files/jivowuvodufirakagatukever.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e42583e928---wiwuti.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/035954613a377f923272c9b17bd2f48a/45072487399.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/6ko2mjgj94fm5he13i93r6uf5i/zowov.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21b1960311---63574887689.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=index+to+mathematical+problems+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_off0000e555.bin
da48dcf15d0d9f42fd0e040bf97e9ad4c5b5cf4979a0f803f3afd79fd73c1412
pdf-font-stream PDF embedded font (sfnt) at offset 0xE555 17348 bytes
font_01_sfnt_off000112c5.bin
ba3fecd70a150f50a2f5b20f4824eb77c51033a8dd0d53fdc72cd6e0b49897e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x112C5 11080 bytes
font_02_sfnt_off00012c1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1D 16792 bytes