Malicious PDF — malware analysis report

Static analysis result for SHA-256 762781b2b04a287b…

MALICIOUS

PDF

80.1 KB Created: 2021-07-31 19:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 39f897010048c67c5002e0447a1e5220 SHA-1: a4981237ca7165f7100a351f8feeb2e8dd1492c3 SHA-256: 762781b2b04a287b7c587091a78307eb2f9ae3e909a79acfbe0e9677fb7854ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1393316f7---zemokuviwumomoditejifoza.pdf In PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c53c331a5---4002032614.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/mujegilevogizofuni.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/86492938716.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/zosezod.pdfIn PDF document text
    • http://perseverance.cyou/updatefiles/file/11254588484.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/nisavoxazosinurafuda.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/70996772961.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/wumilufapenawifude.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/b6mlj7f4f1bgliv9ghn64r4hk5/muwaka.pdfIn PDF document text
    • http://bscartridge.com/pic/60682347687.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/dibowuvuzikerizavoxet.pdfIn PDF document text
    • http://qzgj.cn/upload/file/82745681225.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210708154620_1742619324.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/topaji.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/99246793474.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/c870f85cff7c1b7ee5ab60b2bd72df1e/zanuwifofisudeza.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3d3f76c32---11312521227.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/datijedivelodamagan.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/532d6e497f7ad5f37fd6dec64f250843/93823974696.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/kalewugimixuvusiva.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/48677258767.pdfIn PDF document text
    • http://absigorta.come/file/52265431085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=teoryang+formalismo+halimbawa+ng+pelikulaPDF 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_off0000d4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F6 16312 bytes
SHA-256: 84e68b3b758ed7e35eb82bbd74fce08ffbc42d360f22c664555a309b2ec6ae73
font_01_sfnt_off0000ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 11200 bytes
SHA-256: 762c7435714f46941f44c4dd12ae93d1139707fec90dc473032e418146ae935c
font_02_sfnt_off000118f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1