Malicious PDF — malware analysis report

Static analysis result for SHA-256 091309b338bc15be…

MALICIOUS

PDF

71.7 KB Created: 2021-09-30 12:00:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6249a5131279ae4583f95df4f8fd1e8d SHA-1: 5eaa81ded8924290a45c2a3c5781921914ae3527 SHA-256: 091309b338bc15be02b19ee154f2752c22cd88a638f97202a200ab15e0debfe5
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains multiple heuristics indicating it's a link farm, with several URLs pointing to compromised CMS uploads or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://bbox.ru/images/shared/file/57012474822.pdf In PDF document text
    • http://bartuceviri.com/userfiles/file/28235950331.pdfIn PDF document text
    • http://olapromos.com/ola/uploads/editorImagesfiles/lasiguvomuwufizumozux.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bee235671---kivokilopex.pdfIn PDF document text
    • http://generoussecurity.com/uploads/20668475175.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/16207852762.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/19957230577.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/fatajisogaxorazeweno.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/55935775804.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131f9b3b62a2---bajefem.pdfIn PDF document text
    • https://comfort8889.com/upload/files/66712609729.pdfIn PDF document text
    • https://keongracun.org/contents/files/wagibovesamokexajikodogip.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/39726070787.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/pajuvasedivilinebovoje.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/2704001027.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/dunalibaxomukesokase.pdfIn PDF document text
    • http://c2r.su/uploadfiles/file/2021091617311773499.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/dilesavurevo.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/mazitupaf.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/vetazidetuluwumu.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/wategulolo.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/zariwixekuva.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/nawisupisudurizejixi.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4967af546---19822518582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+hack+others+phone+call+historyPDF 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_off0000b392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB392 16928 bytes
SHA-256: e262545f69d7fa62e901249fb2dc21f4730873b2a8d851b8e3c4ebd9147b73f7
font_01_sfnt_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C1 10756 bytes
SHA-256: 2b250cc8db2e4b1b4ee0af97d9de3111464fdfa7eb9c8a44dcef5e00a11f61c2

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