Malicious PDF — malware analysis report

Static analysis result for SHA-256 735e3cbc18957a75…

MALICIOUS

PDF

87.8 KB Created: 2021-07-05 19:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 99472dbaf4937e3735128ec3507e4b19 SHA-1: 65ae43cf3446ac35d986fc9613b24b30de4c8160 SHA-256: 735e3cbc18957a75c06b1b929d1de908607c4558a513c72be864e3fb22e21075
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to websites hosted on compromised WordPress installations, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/5e859aa8ce9c5213f72e9b9077406913/74337557127.pdf In PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/62150977185.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/0f779826452511eedb77cde727d13211/96278680081.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/99456848874.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/47614282035.pdfIn PDF document text
    • http://askort.pl/Upload/file/ragude.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b039395b073---12992362307.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/fmpf03dish4n4netnpdujqvmul/jawafizopiwuva.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609194558e8d6---1716955726.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f541fdecfe---15540173004.pdfIn PDF document text
    • http://asustainable.com/global/file/wewakujimofe.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/xubupibawolamafoxagu.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210704204322140.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/13093474394.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/kixumigeniturubafin.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/71219280414.pdfIn PDF document text
    • https://arerp.kr/data/file///17575058182.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d02e2819c---rulasolifowobufefufaxe.pdfIn PDF document text
    • http://starlightskiothon.ca/clients/4/44/44db284a3a4a6a3f34f8f2fa71918f98/File/laxabuxiwinaredu.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/zidovapapokunijo.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/75660846990.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/larajegezub.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/niwifuki.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b54a5c3e785---fodabuzizomakejutufogame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=can+i+eat+apple+before+workoutPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF546 10632 bytes
SHA-256: 49aa6cc43452712b5a3825a077f7f2bfb8aef640a0622185bc176f3a82496126
font_01_sfnt_off00010d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001259f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259F 16964 bytes
SHA-256: 414bc90b811527b1e88191368c0ef23e57c7f8ea9464f9e15d15b6da705e397b

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