Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d44360e0df29d45…

MALICIOUS

PDF

73.5 KB Created: 2021-09-18 12:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c68cff9384e8730292abd3d703e4170a SHA-1: 71631b3a99bbb338138aba741db86d50f3a44fbb SHA-256: 6d44360e0df29d45fb56c343df9a5887d204c8699923a0a1e343a48da244ccc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was identified as malicious by a machine learning classifier and ClamAV, indicating it's likely a phishing or trojan delivery mechanism. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. These links likely lead to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://unifor975.ca/userfiles/file/debotapalekupamajafonuk.pdf In PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/jexasagevasipimugorisaj.pdfIn PDF document text
    • http://sananselmo.com/wysiwygfiles/file/xoxijumometupaworibagi.pdfIn PDF document text
    • http://pileki.com/imgup/file/34389502507.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/55290136106.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/jisuxikibegobux.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/mebiwomefibebejukavada.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/jetevekafuzisoxip.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/gukebobimirusamorodedavu.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/64900791619.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/wakijemub.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/21069824470.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130c27803cc1---58956833373.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/nuvedirated.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/76809021691.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/tafofodev.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/vuwirete.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/0093b196a7c78415c2e1ed904f60fa30/6100511660.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/22417943699.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/62171631662.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/72602494731.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/65067641077.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161423f27a5e8d---58258450374.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ac8e61f0f35138dae3ba0f377f93410e/67842017646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=romantic+hug+quotesPDF 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_off0000bc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3E 17104 bytes
SHA-256: debc6da7bd282f28fec764c692571132deeb157835ac5bef9b6a4ad6bbe73915
font_01_sfnt_off0000e7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD3 10824 bytes
SHA-256: 3b70eeb9b73966c326aabbad9749610d4631dfb1b365d35be28fc620143ecd57