Malicious PDF — malware analysis report

Static analysis result for SHA-256 080b3c04c1f9f525…

MALICIOUS

PDF

121.5 KB Created: 2021-07-05 18:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 796d62ce2fe5032138923ad2cafed239 SHA-1: ce9870dc484b79809992d162eb1fb22a8a9265b8 SHA-256: 080b3c04c1f9f525b2745cddbb781336d78497c83c5516942f409f574bf430b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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://aliceinformaticasrl.com/user/pages/81960511573.pdf In PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fcd97f1e2---fumoxezogazu.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/mehgt77upsck901b5dtb4j5nvg/26858932418.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/41d54b7f5247ebd7b37d4804d3e5c631/govoruputixipabe.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/3bc778582435e860def023e36fbcb25c/pinife.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a00ee497b4f---mikosenex.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdd67506d5---10568182976.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/romapeji.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/nosuvirelixodovidokedene.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccff954334---76199888347.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/papikojosapuwenovafovez.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/piduta.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/68159913588.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/f6d8e885302ba763749b46fe48f6d6b5/76171062540.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/60920628151.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a04395977fa---tubarisakutomivawarigip.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855d594de05---gesez.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/bukimavapepigem.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acddb070215---wupemugurumarul.pdfIn PDF document text
    • http://email-database.info/userfiles/file/36544659750.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/2c8f634484b6bdec0ebd926f9dd5f8d0/90738184202.pdfIn PDF document text
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/zigakigade.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894106694e2---73657065509.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/2883125333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hunters+in+the+snowPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80E 46268 bytes
SHA-256: 180ca525480305f4de35daa302770770e3cdbde461b5b54b186bf22fdc3f1d4e
font_01_sfnt_off000166ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166AC 10172 bytes
SHA-256: ee9cee776a132b2ac008dcabf17c7e8525d904d35ce7d5b554bcece8240d6a8c
font_02_sfnt_off00017d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D68 17140 bytes
SHA-256: 37d101af6ed7783c7861bdc28585151cca7ec45255162a1fb44491493d5f733f
font_03_sfnt_off0001aa13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001c224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C224 16180 bytes
SHA-256: 5fe250aed078d0ee0c8a6eeae28bcf3660a94536c0a26c91209d7ae7f0165d2f

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