Malicious PDF — malware analysis report

Static analysis result for SHA-256 1997d1df4ea9a945…

MALICIOUS

PDF

86.5 KB Created: 2021-06-28 11:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33be1e2326cfe704c1542d6c93a418bd SHA-1: 4784dbb481965d45bfb1caa27234b8d940f2955e SHA-256: 1997d1df4ea9a945690f4c6c1f7b2120519c86a008f3dd27d8a1d76659733f01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms strongly suggests an attempt to lure users to external, potentially malicious, websites.

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://drafthe.ru/uplcv?utm_term=find+new+line
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736ef8dc2fc---navavunupu.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6540c9ae8---sabogakepirokavemi.pdf
    • http://devitohomesorlando.com/userfiles/files/tamajeg.pdf
    • http://www.allatpatikapecs.hu/images/file/rupezedopuvefuzuboxebe.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a2d8b2033---27100790213.pdf
    • http://groupkaishan.com/d/files/15449059439.pdf
    • https://okud-istra.hr/userfiles/file/93693315715.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/753a6dvtri0egg667omksdummq/75218965670.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/99eb25ec13e59609a8eef95eaf5143d7/98142099476.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a246828d315---40304174729.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093d443a00ad---napofajijozisumujem.pdf
    • https://bloomland.com/sites/bloomland.com/files/nakesavan.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb6e9a4ee5---10199581010.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/b069f31ae2bc79863df8f756350d88b3/85952865838.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d30f8ab94c---boxunos.pdf
    • http://dinskayarealty.ru/media/file/31214100363.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/menipasariwojude.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/343bcc46cd27aa1f3096dc38a25e896a/18197035961.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/71d8624bcfcd484e20e732e810bb477e/lalopoxawogilijuradi.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/383c8m34dom4h8hivr5d2bje0u/pemigifevedotowujovon.pdf
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/xapuzino.pdf
    • 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_off0000ec8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 16792 bytes
font_01_sfnt_off000104a1.bin
73ebed41dc2c246e228ca5979a988b1036794ec9276f8958bc8521b1cee0c031
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A1 9656 bytes
font_02_sfnt_off000119a2.bin
f1825e1665a312d568e3fd14cd0924b4114099e53448b8b3d08a5aaab4c3dbd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x119A2 19664 bytes