Malicious PDF — malware analysis report

Static analysis result for SHA-256 5759b14820dba27f…

MALICIOUS

PDF

84.9 KB Created: 2021-07-18 00:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 160b37366787a86ceba6b5c6ecf805aa SHA-1: 4baab6de22163188af81f8c664bd13c540e2c15a SHA-256: 5759b14820dba27fa77b5b1f84e4b6a2aa2c745cee5972f094c5cec071a86fce
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 an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external content, potentially for phishing or SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/moduwota.pdf In PDF document text
    • http://manhchenang.vn/webroot/img/files/96998911401.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/89805349241.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/wabipupagedigagomuku.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/dj2kj5qah29dplu4qbajgac4ng/jojowidukoravogenofevukir.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/51974653976.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/funanenesokonunega.pdfIn PDF document text
    • http://slanfusa.org/clients/47225/File/jefoziv.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160727a64d6cd7---lonojapafizetejerafa.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607779f6add57---10628992267.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0839c75e69---serejanokasifipewum.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/54636110629.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9e26ea0b11bc60519aa0aefe23b7bbb1/tafedipifulonepusasarawuf.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/1953248599.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5009bf82c---35820129974.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2045e741ba---75374531366.pdfIn PDF document text
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/55413898014.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/u7okg5f34f4dpbm24dtp7ai0so/53618547219.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/73147868812.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/78904258908.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/6l3cb7hroh13pp0f6ncd4nihi2/zudavonitaririje.pdfIn PDF document text
    • http://gabortech.comadmin/file/21575193997.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/bapigidab.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be3cd5b5e7---38786931875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=an+introduction+to+language+and+communication+pdfPDF 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_off0000ea90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A2 16464 bytes
SHA-256: b60bc9a8b7d840ffc21db8c8c04ac5df17ef06a26d3d181e10100308b9cb1286
font_02_sfnt_off00012cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDD 10876 bytes
SHA-256: b42f5e35fd01bde10039c2c35738986673c25d9d613e9158f5f2b45fb64938b4