Malicious PDF — malware analysis report

Static analysis result for SHA-256 717ddf4f7723f5a6…

MALICIOUS

PDF

74.3 KB Created: 2021-09-09 02:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1e06e824587d7c6feb5c3b7c22654ed0 SHA-1: efd2bf538f4d11906b4c0cb711c6ffae6d3e7a26 SHA-256: 717ddf4f7723f5a631724ebd387fe7aac558df6846483854aab362676f915705
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a variety of domains, many of which appear to be part of a link farm designed for SEO manipulation or to host malicious content. The ML classifier strongly indicated maliciousness, and heuristics identified the document as a link farm on disposable hosting and potentially compromised CMS uploads. No scripts were extracted, but the structure suggests the primary intent is to redirect users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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://drafthe.ru/uplcv?utm_term=why+does+sulphur+not+conduct+electricity PDF link annotation
    • http://poetische-malerei.de/web/editor/files/40259782673.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/gigoluka.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/32284934828.pdfIn PDF document text
    • http://www.bash.cl/media/file/pifixamiso.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613933a0cc83b---tidogelupotudux.pdfIn PDF document text
    • http://reedxtrainternational.com/uploads/pages/file/50388644047.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/wibewivivu.pdfIn PDF document text
    • http://one9five.com/userfiles/files/75777780950.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/tunupokabuvef.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/84849593387.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/3617863531.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210908/files/20210908020244.pdfIn PDF document text
    • http://anpo.vn/upload/files/35335714547.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/8632156941.pdfIn PDF document text
    • http://aolisenjiancai.com/data/files/83007221874.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16130de671d753---86277565015.pdfIn PDF document text
    • https://nevisnews.com/userfiles/wimotuligijavude.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090221491083.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/bopasonuvedokuv.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mibivipilugetuwusuvadil.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/vavanowikixabud.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/73806856306.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/62655346351.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/1b06d099409415f467744353bd9f24ba/10809320618.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/45048531144.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01A 10656 bytes
SHA-256: 8a5da7484c96e5fc3c824dd55139ab70ba8a8ad82d1764be8746ba0788ced951
font_01_sfnt_off0000d873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD873 16604 bytes
SHA-256: d2d6caa94469f37edd5fa06b35f220d9dcdd810a62272e18e3b6449fe9975d39
font_02_sfnt_off000102cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1