Malicious PDF — malware analysis report

Static analysis result for SHA-256 14311dc5ea54235d…

MALICIOUS

PDF

89.1 KB Created: 2021-06-30 00:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5705639af5e4a68657ba5e501d1e3af0 SHA-1: 8c35759383cd0a48d2f800d88c7542c253b109a4 SHA-256: 14311dc5ea54235dd081c71730dae5f77b7ee2174868be83648763686df20a7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, directing users to multiple compromised WordPress sites and other domains, likely for phishing or malware distribution. The presence of external URIs and link farm characteristics strongly suggests an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://oniceh.ru/uplcv?utm_term=best+dogs+for+anxiety
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/5b341c2e8a59ec1f6461424994f157c1/dirupi.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c39b89f16d8---37720942651.pdf
    • http://ligonfamilyreunion.org/clients/9/9a/9a44987365eba454cd9b2deda39aa7c0/File/59471957596.pdf
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/96138958260.pdf
    • http://a-kamen.com/userfiles/file/56897010267.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/79278878a74d533df0c5be325faaea8e/kunifepidutotugiwuzej.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f92cc0a2f2443e64adec351bdbc412ba/bolejikedozeguv.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7abe7c0f4---liruzawo.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f51657d0ae---nubor.pdf
    • http://www.contectrade.hu/fckfiles/file/2051069873.pdf
    • https://securityguardsupply.org/php/uploads/file/zuvozokijususotegimovudu.pdf
    • http://naucseto.cz/storage/40380192506.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9730ed94b---12333438467.pdf
    • http://bannails.com/fckeditor_userfiles/file/poredowe.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/45afbd40469532da5b9930808d55d4e5/202193897.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609085e23dc41---rugel.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac73e7698b---wumajukigorolazuxusebe.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16073893f5ada9---pulafakuzogema.pdf
    • https://xistenze.com/files/files/4979182465.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081793064fe7---13375760442.pdf
    • http://hurtmar.pl/Upload/file/76114171405.pdf
    • https://gachbinhduong.com/upload/file/dizuwobavuratoje.pdf
    • https://asiabiru.com/contents//files/56674747735.pdf
    • http://abogarestudio.com/userfiles/file/59543941272.pdf
    • https://dm288.rs/slicice/file/buletuvivebilew.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_off0000fa8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8A 16792 bytes
font_01_sfnt_off000112a1.bin
2ecfb1c27395412462147bf8795e573eec83bc391c5d538abd003dcc438a7db2
pdf-font-stream PDF embedded font (sfnt) at offset 0x112A1 10752 bytes
font_02_sfnt_off00012b5c.bin
030b5174d88c13132692b7930a3168d7a4cb10ede1a73511b000928f5dabf939
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5C 16832 bytes