Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07320362c95d666…

MALICIOUS

PDF

77.7 KB Created: 2021-09-21 04:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 70d44126e35980adf6c2e3632befb3eb SHA-1: 6db25477f4732bbfaff521c6757db671966cf31f SHA-256: a07320362c95d66692f7bc4c13957f7feb54b991816ef06be2aeb57cf7cb84e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d483aad9189ede0a7ea63f48992d4c8a/68504828651.pdf In PDF document text
    • http://kompletucetnictvi.cz/files/file/luxakezexa.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/12419062213.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8fe542163---2268544119.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/dipojokudumuliwuso.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/68295281305.pdfIn PDF document text
    • http://carbonelite.ru/file/zogozezejisopiwubegi.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210916154406.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/nimudojezi.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/67372750676.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/60783984461.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/22092614393.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zoxidosazanakunego.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/8039591901.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/pubogofijofob.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613db53fb4d48---buvodam.pdfIn PDF document text
    • http://faradbox.pl/files/file/77041366053.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/59179629667.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/lenemaxupumesad.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/37746173839.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/superude.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/abb3e67e3238bab6ad17d562544c90a5/nevuvomizovobin.pdfIn PDF document text
    • https://blgjad.com/upload/files/11479470420.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/37405470505.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/9c33c8818c48718a11708a82527906ff/34164144182.pdfIn PDF document text
    • http://chinahongji.com/d/files/winufimiboxofute.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1b12ad57e---99049113391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=bapu+amrit+maan+song+downloadPDF 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_off0000c774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8B 10840 bytes
SHA-256: 763b731c161401bae5639a9b2693880efb9129e127d2e4ef18e516943bd7694f
font_02_sfnt_off0000f85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85B 18572 bytes
SHA-256: 96aac51d2565b4de58421731a1c822ee74ce781d4e224e78b4c00637eb556a55

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