Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f0d7a7b0853a79…

MALICIOUS

PDF

82.9 KB Created: 2021-09-10 10:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: be0872e1d7589f719eca39c2606f17cf SHA-1: a95a2c646d2f7798f091e45fc658783eb4ef1cdd SHA-256: f0f0d7a7b0853a79ffcc1d8b7a8f5be0158dc2db87138ae46878057c8a508633
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to infer a malicious link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://poney-club-romilly-aigre28.fr/userfiles/file/64899508798.pdf In PDF document text
    • http://fge-service.com/userfiles/file/modafir.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/5fbe24ea0a46087bbdb73ae6d794524a/13369227890.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/44243387458.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/zinaxoxotereb.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/48293432940.pdfIn PDF document text
    • https://businesslife.com/content/files/pupuxa.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/10669625253.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/vugisarexonoxefasiguxiri.pdfIn PDF document text
    • http://ned.ru/uploads/files/pigikopuvos.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/lizamovujonoduxitok.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/80986384074.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/93714940957.pdfIn PDF document text
    • https://apra.pl/files/file/zukonulumezubezo.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ar85hatjh9nra0s98hnl0bo3cm/14131680542.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/poraderodijesokesap.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/danejigosafemiwo.pdfIn PDF document text
    • http://inercial.es/uploads/files/38327389466.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/danoro.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109040329316270.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161322ea0742c3---48104839384.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/zugixagowoj.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/lepoponawefazekelilutofum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=boxing+match+live+stream+freePDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF01 11004 bytes
SHA-256: 9afb45eac7cf59af8fa2675add44e946ea6a4d358815bbaa520bc1c03a8bc1c4
font_01_sfnt_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001108c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108C 17476 bytes
SHA-256: 23aea71843cb203354fa308e126bce58aea503e896acbeb9dc8b653907b9c921