Malicious PDF — malware analysis report

Static analysis result for SHA-256 10dc89db27c01c90…

MALICIOUS

PDF

84.2 KB Created: 2021-07-14 07:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 346d48bff04a6661247374127474f167 SHA-1: 13254f5bbe34711607c2281f7ee455774f772e2a SHA-256: 10dc89db27c01c90d4aa1fd0ecffd258168070bd4f451ad33690801230d689fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting. The primary purpose appears to be redirecting users to malicious sites, likely for phishing or to deliver further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://noddy.nu/images/file/24983031624.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/0npc6bj0510tgqnltduvkrdkk8/59289384091.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/akqm39spqvalnircbb2l4rgcv7/61152508752.pdf
    • http://akkoryazilim.com/userfiles/file/9341380775.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbc244cc7d---12926537440.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8109836c12---ruboxepu.pdf
    • https://tiguan-wiki.ru/file/saxumarosivutumekep.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c948a56ddf4---72134728447.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/biejelmcpgu6ak7ela4v1u47ab/zilumisifelekolofafewezes.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cd7019c73---39007435752.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/73683697208.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e26aa20ba---dakizor.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160921e2fe7eb0---71982342847.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4d8c3cd27---65721825047.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/c63l5o9j48jncejt0cf7i96e62/pujin.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c28e9aa9eaa---kaninojakawesep.pdf
    • https://zlatartopalovic.rs//files/94568095864.pdf
    • http://autoshiftbid.com/fckeditor/userfiles/file/vozomuxoferoxorobonitop.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609506953b04c---64105783127.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cab1dda6a82---rebinosumamavuwe.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f594a66387---92411976018.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=manually+download+windows+8.1
    • 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_off0000e764.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE764 16792 bytes
font_01_sfnt_off0000ff76.bin
b34b9057d816fcd00f55d72e22a77ec01e71d26ffa41baa9d1c87b8bb98e4898
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF76 17296 bytes
font_02_sfnt_off00012b94.bin
f3960857af4a2e20a5990901cd8b4256d0603f4c98df540f3c9aa511e8d3b5cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B94 10532 bytes