Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e1b872fec1b4f1b…

MALICIOUS

PDF

101.2 KB Created: 2021-09-12 21:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fcc9bb6b639cd88bfa15077ddcef3acf SHA-1: 0a611c320662fdbaa65c52915159e2a8435de7f3 SHA-256: 3e1b872fec1b4f1be66a8ac9457908b42195520594b712cf38bc30c54ec0c0f9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous disposable domains and compromised CMS upload locations, likely intended to host phishing content or redirect users to malicious sites. The presence of external URIs and link farm structures strongly suggests a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://allytemp.ru/uplcv?utm_term=chrome+dino+unblocked PDF link annotation
    • http://camberwelltaxi.com/survey/userfiles/files/xagukafo.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/saguranaluwu.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/93706971578.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/bebujobudika.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vk3mrk218e63kj9oqqitp1c02l/85227021562.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/41619828163.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d137544a27---86069066141.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/96198791689.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f54723852---94521183625.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/1a49d274dbd91f30d8eba2de7b11daf6/97691099057.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/48679676440.pdfIn PDF document text
    • http://packturf.fr/files/94004368057.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/jasawadexenepevojizop.pdfIn PDF document text
    • http://beta-rc.com/upload/files/3769326585.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/posav.pdfIn PDF document text
    • http://dsagco.com/Upload/file/16054919561.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/foxijataxototukopijusaw.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/dalerazuwi.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210909105922.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/wirenuburozajokazevomel.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/tetazuvatoraxuginik.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/11074898613.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/76725393029.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/juxuzixolab.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161369645d1065---21480663059.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612faadbb467a---29684727223.pdfIn PDF document text
    • 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_off00012077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12077 20952 bytes
SHA-256: 500b1ed6684192c95e86efe72d1b12c642a619ff48ff2775039dc175227bebfb
font_01_sfnt_off000156cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EE3 10572 bytes
SHA-256: a879578838cb119399309187e422cb6fa66733dbbdf4c1d94c504893eecac254