Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33976e0a7cf243c…

MALICIOUS

PDF

72.2 KB Created: 2021-09-08 16:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e9e489b30c474c343314f7e8e63bc96e SHA-1: fd9fb1cc8f0216532b1310fcead8edad4eff91a9 SHA-256: d33976e0a7cf243c90f52d0002b3b4b559f251fbb4f48264255b473c6b1b1cfb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further support the malicious nature of the file, likely used as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=convertisseur+d%27image+png+en+pdf PDF link annotation
    • http://bezpiecznamlodosc.org/files/file/48731640722.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305bb751f01---ramitutijivow.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/29540692975.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/edcc7a9957c0268084fcb57e52522aec/719350920.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210903_776EBEB06A00EE61.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/37701630382.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/71648789978.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/43988591786.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/zitafebafebof.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210906181645.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed61e4df05---37598608330.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/46248974266.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/tibafejusuno.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/68677408177.pdfIn PDF document text
    • http://www.mousumibanerjee.com/fckimages/file/22864426865.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/0cb4c8f947c8ce9d358ffd9999840290/98085259824.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/letakutexewug.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/telomivedowovogaru.pdfIn PDF document text
    • https://mklaassen.nl/images/file/11262463867.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/61218865510.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/fazixezavegaxateguz.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/biwegotopevodowokir.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/nozefukipab.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/60164465567.pdfIn PDF document text
    • http://bastola.org/userfiles/file/58632474981.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_off0000b929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD13B 16272 bytes
SHA-256: ef3fddce5c7ec2919d8e1345ca575570cbfff1b37c728f782bc658247f0e6fa1
font_02_sfnt_off0000f9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A3 11024 bytes
SHA-256: 1aaabcb2df327068e0a6316fc2c97931dc72c03d48e585fb797c4cb379e9bc24

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