Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31d700d1b429a61…

MALICIOUS

PDF

73.0 KB Created: 2021-09-12 01:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a6a9fabe8b3fa1fc18680fd62115a5e2 SHA-1: 8fcb872c4c4d18d733c307e798cf98c5e286dc66 SHA-256: c31d700d1b429a617b053991f5cbac56434785e14b7c32434ad102ceca447678
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, some of which are hosted on potentially compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://actorconseil.com/files/file/tavuzatosogibofudumaj.pdf In PDF document text
    • http://andrelandberg.com/userfiles/file/bivojirijesidiwazak.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/46006306981.pdfIn PDF document text
    • https://network-italia.it/file/96171774078.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/tutatilajitijimudun.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/aaf173f4aa936200523e6cf015b0d787/57408587606.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/15874783413.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/10070456483.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/vomimuzofogezonize.pdfIn PDF document text
    • https://12shio1.com/contents/files/42481359420.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/256185892.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/boxigotikizivowifunise.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8f249b81f---dipefifawitenadiri.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/daleg.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/66674781210.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/laginopukotisumov.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/d6f0771fd0268a8a5bc547e31d6ded77/49179257998.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/74570705646.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/navebelidijujaravobodutu.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/13183242105.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/lunodewato.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/80288512311.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/tevoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+sync+2+bluetooth+speakersPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b77e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77E 11024 bytes
SHA-256: 9c13d4bf8cd04ea247cee06fbe0ece8993da13bf231468f3bed9aa03c327d022
font_01_sfnt_off0000d107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD107 17504 bytes
SHA-256: e734a62a83fd5049d725675ea90b063b2b520870b43d1d5445460a389614412e
font_02_sfnt_off0000fe76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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