Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9bf7e13d8f51dd5…

MALICIOUS

PDF

86.1 KB Created: 2021-07-09 07:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dbb34506198f4836c5a490fc8b5b94f6 SHA-1: e30b989863ec976fab871dffc6842b04ceaaa36c SHA-256: d9bf7e13d8f51dd53c9f1ef2771e8f003502a65cc06e07b175cacd58626321c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a5b10dbad3977f42f9cff9a751cb5853/86358215140.pdf
    • http://nessium.net/userfiles/file/63408396169.pdf
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777c519c422---lesezuwepoga.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/begesaruruvinoseferagemas.pdf
    • http://arcomproltd.com/userfiles/file/kirug.pdf
    • https://fertilizergranulatorprice.com/d/files/vofotunogige.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16081a1ed736a0---sisajetijowujewamibeje.pdf
    • http://webbuilders.com/files/file/98200720553.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1260167cc6---95247849064.pdf
    • http://acecaalcoy.com/userfiles/file/lijufuf.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/18fmvsokh16ttcat01fsnrifp5/doroxa.pdf
    • http://nordicaluminium.ru/userfiles/file/guliboxisukobujusabe.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ce891e581ac---11700792504.pdf
    • http://sakuragiramenandsushi.com/uploads/files/92650442350.pdf
    • https://mallncart.com/userfiles/files/nixililibijipipizekuji.pdf
    • https://hfbee.tw/upload/ckfinder_temp/files/20210701041317.pdf
    • https://rotterdampools.com/contents//files/45713905789.pdf
    • http://iehyun.com/editorupload/file/41910623595.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/5fc0d675d4787522141d084f2afb32c8/12168474919.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1e8389b0e---fujogavibelitanaf.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/61d5bca041e3029ce4a0eee0121ad8b0/vidimapoto.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f3fa6b7f6---jirubibibizifezerurape.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/27f163f5328775e212e437b1be293231/gemetokirefenuniwebemofi.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/u6amn9fct8pbmljdaf9h5sstq7/lemuzufajarurezafomimo.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/ee5f51da960ffb68e86d562d31f8c792/4517515956.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=living+things+need+food+and+water
    • 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_off0000efb4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB4 16792 bytes
font_01_sfnt_off000107cb.bin
5defd974f764f76fd3770b9130ceb5c820c7d6374693f92bb02d54a5c71a27f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x107CB 10696 bytes
font_02_sfnt_off00012021.bin
23b222604a0018344f4d11dbfb753a986aabc48b9ca8afbd6ffe0efeb4a2493d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12021 16592 bytes