Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d4cf2d41da0d00…

MALICIOUS

PDF

86.0 KB Created: 2021-09-05 01:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ea57318b75701c8fe3cb852f9562e5ff SHA-1: 02d1182350f6b75ac89efdff7bf5e65bd1488633 SHA-256: d1d4cf2d41da0d00196ef8acf58d356951862ef6d04c56af531a4d11d4abfd21
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.anclupnapoli.it/userfiles/file/bugivalokeripogajotated.pdf In PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8fa48089c4081322f6388c58e72834a2/87123784596.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/251484530939c80acd1a5df42a36d01a/68492664618.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/c7915974c8237500c0929b5be1e0efb7/49368404922.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/74c1808f8ad8751f4176bb28aff13246/29411206663.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/591781e16e8a5984071e719294c37507/kulafodalunaku.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/kujisefinu.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es//ckfinder/userfiles/files/26519295332.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087ec8f77a0a---xetubipaxereg.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/83589284958.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/jumevelonawafe.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/19c8827c4f3f1abad9b4d17b1737cd52/liriziriwomalikifimije.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/91922382987.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/29760546308.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/20533747388.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6c76b1fa04ecd620fe28ca52fbf48241/73223141039.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/d47f1edb8dd8d5dcc3941cbcafac22d5/99044136976.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ddc9c38fb34---vopazol.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/44013723993.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/bfdc9f2f2041c2af8ccaaa64409976f4/45371990998.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/f781c9c5a2e5061bad914a606930d990/verexuvimisetef.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210604_DFDCF14775FE29D7.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/penokeve.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/sebadadofodilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=adlerian+therapy+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_off0000ed7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7A 17644 bytes
SHA-256: 1e1c924cb29c4fb3776db22eef38a429a91b7b6d877867cf98dba737a8ba05e7
font_01_sfnt_off00011ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD1 10400 bytes
SHA-256: 0b4c1ebfd5c8389ff65a4aa9649e87e909b8e929be15eff78d4b0f1256dfe5e0
font_02_sfnt_off0001323a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1323A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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