Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b03ae97a36e270…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 15:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d19f8235041fe3ad73dbece495c1e658 SHA-1: 22402153d8a5d861fb9bb81a99d2fedafb3e6573 SHA-256: 07b03ae97a36e27022bd9d4fc7c09d88e078b9225555fd5c5acacd684aee4614
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 compromised CMS upload directories and disposable hosting. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to redirect users to potentially malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f73c77536b---87448919790.pdf In PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/virotoli.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/77632a398a89f59373dd937a5507e001/6978902849.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/a194d6cfd92fdb2ae4354f47bc83bda0/jibaniz.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608489550affa---68208745093.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609aee13310cd---xotexujozifodepeg.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/venasuxivisifiwo.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/16892136739.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91750056262.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087686c1248c---nawosazufeviwelosuwar.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/lilobigetadepasem.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/verorogivoduxamitanule.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5462ed419e---97459461194.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/57865379610.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df93c5de2b.pdfIn PDF document text
    • https://mauspro.net/upload/files/zafomejujarevik.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/puziraxilasodeberab.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e13df454790---tifusiwobum.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/2672939006.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/suliputusifonarebugej.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16080576481192---tupepejobefo.pdfIn PDF document text
    • http://bdnchem.com/upload/files/giwomilu.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dce9de52ea3---fovev.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/fubinexaxidus.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/9918345275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=declaracion+de+los+derechos+humanos+en+colombia+pdfPDF 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_off0000ddb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C9 11028 bytes
SHA-256: b865c8207b408f36aa614d681d71952603c477283ead0fd66c1bbdbe98031367
font_02_sfnt_off00010ee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE6 17652 bytes
SHA-256: f4e28b1bbe11dbd23d3bda18e07ac9e610d2f156e1bc34e5e1cfacf67fd1f4a0