Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3e7edcd3f593c6…

MALICIOUS

PDF

69.9 KB Created: 2021-09-08 21:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ea1d2741f9f144731f2a11356379419 SHA-1: b899307b68948b8e392c3135de1b75c71d544a5c SHA-256: ff3e7edcd3f593c6388c10392b7a4fe5debfa4a15a4ae03085a80381d232ab9f
196 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to external URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests the PDF's primary function is to facilitate initial access, likely through spearphishing, by directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b8130aa0aa7531a255ecc984a318ec25/63239073589.pdf In PDF document text
    • http://fernandopelosini.it/userfiles/files/bisoretotojekijora.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/vovonulopekijol.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/rabexixawizujejepujufus.pdfIn PDF document text
    • http://kite-surf.sk/files/85547909379.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021090305192873499.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/fb6adb0fe913b36aff439f1cb982accd/46649934976.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/66551643465.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/92905633480.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/17826698004.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/70082151440.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/5705244305.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135190c33d80---kelojefojaw.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/68466360004.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/sukulubuxamumirofivi.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/39587168129.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f6cbdf5822e30c970465e06816c30c51/25841965816.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/zagumera.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/54375086240.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161300538469b9---27258208519.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/87468564962.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/73584592460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=android+notification+folderPDF 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_off0000b3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC13 10284 bytes
SHA-256: b9e83a9b3b79af51f6367889e8796a036618665b311383f037ba0edb48f9b82f
font_02_sfnt_off0000e354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE354 15532 bytes
SHA-256: b694061f07a185514195ced64ac12ca9b59999f912f28edf345744d4b929e1e2

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