Malicious PDF — malware analysis report

Static analysis result for SHA-256 d506ed37798239f3…

MALICIOUS

PDF

78.8 KB Created: 2021-09-08 02:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 192eb5ba4456ef7a5629e3a4ab500971 SHA-1: 27b2f2825bed9b194ae6d40882af1f534af7ac95 SHA-256: d506ed37798239f39851db7f861a35731606a4aa9921a396021e53a858057a2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest it's designed to facilitate the download or viewing of malicious content from external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://unseretochter.com/images/file/wofukijawojizadaramule.pdf In PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a44146e53---63245994020.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/3543274472.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/bikagawarolarawud.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ih6om0am45ffd48gg8s214lfbf/41684902670.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/setafemulusuropadaromubob.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/mikomutelokekuleduju.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210514194958155.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/betofop.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/sadigitimavokovun.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/rolidigibumuzumivotuv.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f765d718---80587776221.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099638f2ce20---kixosefagugarifeto.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/4ikdodecfqjj3b7b1lio29ed33/5405972133.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/kamubotulabazifajoso.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/xumidiwu.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210802_115531.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/96068730041.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/rasitiva.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/volavanowipetawil.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af0ea896df---xetogisas.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/87991709281.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/17105365909.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/77189929506.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6c3da82d39---godewagax.pdfIn PDF document text
    • http://www.asslar.de/downloads/33886596873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=livro+gest%C3%A3o+de+pessoas+pdf+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_off0000c539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC539 11048 bytes
SHA-256: 741a5be543d92add4d3cc356516e430e71889d1ba6bfef478961b2cd59463d63
font_01_sfnt_off0000de89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE89 20800 bytes
SHA-256: 8937da87f0b92207e18956465e33dfb92573e0be06621635b45e6e2536e49bfa
font_02_sfnt_off0001132d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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