Malicious PDF — malware analysis report

Static analysis result for SHA-256 433f056571581651…

MALICIOUS

PDF

108.5 KB Created: 2021-06-30 19:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 29924adf9714e5e676ed6687c369d5d5 SHA-1: 8b1ba4c7b46826370d51c836fa14855156125767 SHA-256: 433f0565715816517bfc70ee7de7c1de59149ab50ef2cf3264e89680a0fedb3b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. These links are likely used to redirect users to malicious content, potentially for phishing or to download further malware. The document body is unreadable, but the heuristics strongly indicate a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607085ba4dbbd---32239559209.pdf In PDF document text
    • http://londonjip.com/userData/board/file/27002752412.pdfIn PDF document text
    • http://splogservice.ru/content/file/92047873778.pdfIn PDF document text
    • http://surtek.biz/image/files/20150119_012945.pdfIn PDF document text
    • http://sam-global.info/files/file/mesuzuvo.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/b1dk015l7fpkn2omkf9tphs97a/24401937449.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/8e2dc6f24acbd3df5516cdad23648c62/jurodekojowipawobop.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/296d0b74b541e83b52fccd7e40ceb491/9764821591.pdfIn PDF document text
    • http://sgpeo.pl/users//file/11775154265.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/2ae47e19beeed95caf6810c0f367594f/gaputexusu.pdfIn PDF document text
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/ludetekofuwotupijug.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a218bab0914---62818832627.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/64013769653.pdfIn PDF document text
    • http://asfalon.com/__files/file/mufejuxevusovadirofedu.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16081181ea7404---dajatixorizakisigisifig.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/f7ae1889630573766b83db91c9134c25/lasizademolejisim.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608942a4237e6---sifilogevizipaxofata.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af96aaee120---tisuketidepomojezedoxu.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d541910013c---7596315171.pdfIn PDF document text
    • http://udemadriatic.com/userfiles/files/namikax.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/xuwesikalazakosuxasevo.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/daxanefesirazijavapexiso.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6d7d4d3d7---34164056108.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b34e2cb02---20037468996.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/90b6f0155afdc0bb44a912441e5cf300/panuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=andromeda+soldier+buildPDF 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_off000148e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000160fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160FC 10532 bytes
SHA-256: 886206af27c7bedfca4975606b712cb2dacbe2bdebacfb315dd6c89cef3a7b5f
font_02_sfnt_off000178e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178E2 16920 bytes
SHA-256: a9347f02457bc9fba2df3f962d277749101326089da4432623742e5d14cb674c

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