Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4644f80ad46808…

MALICIOUS

PDF

77.9 KB Created: 2021-09-20 19:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 82bd30575a9b3aaf302a80525b9b7b65 SHA-1: 73968c9ab8d350bdc6c85d6406edefa0f146adf8 SHA-256: cb4644f80ad468088dfef5e47be31d1e1d43be8db69cb055661f02af83cfb654
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The primary attack pattern involves luring users through a malicious attachment to a site that then redirects them, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pistant.ru/uplcv?utm_term=fall+wallpapers+for+android PDF link annotation
    • http://capmar.eu/userfiles/file/52586534363.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/nazisufopadudewixukinen.pdfIn PDF document text
    • http://advertisingreports.info/assets/ckfinder/core/connector/php/uploads/files/zagixefuwatijikixotekut.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/80228950122.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/navoge.pdfIn PDF document text
    • http://www.moyekolodin.com/files/zaregukowopeg.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/nafedixigonizumidegalobis.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/ridefajinidun.pdfIn PDF document text
    • http://vncanada.vn/uploads/files/limuniporuponeju.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/bivuxakofowuxaveboda.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613acdc324c82---pisawi.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d8b29b285d491aeecb19cf0907f6c177/72304309896.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132369b2874e---vonurujisirudavubokalug.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/68749842572.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210912_36D392577DC12EA8.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/85238695955.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/88856035092.pdfIn PDF document text
    • https://wrd13.com/force/file/27656450560.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147f818deebf---sudodajizake.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/83002364538.pdfIn PDF document text
    • https://regiefranchet.fr/userfiles/files/81824989232.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mozipexava.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_off0000c99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99D 18436 bytes
SHA-256: 85b7f278f5a6c8ddfe064fb3a80dbf00ca5cb220000e1b52445d0c63ba8dfd02
font_01_sfnt_off0000fa2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2F 10456 bytes
SHA-256: b780fd9280b8f43669c80a55c96f41ccf5cab96c6d91270fbdc5669d0c17c0a3
font_02_sfnt_off0001120d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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