Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7d29a47a562aa3…

MALICIOUS

PDF

76.5 KB Created: 2021-09-07 21:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3fb04133594cc3a88e1162324c5c2e19 SHA-1: 9819e9d3e9915b40e16e2b8e8cff5cc08a4e829f SHA-256: 4a7d29a47a562aa3eb4040db5a43ab6f3e2afd3e5ff33c2e94889f2d588296eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's part of a phishing campaign, hence the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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=aerobic+exercise+program+pdf PDF link annotation
    • http://bukharaatlanta.com/sites/default/files/file/12518004542.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/bewolobutanifizusamuxita.pdfIn PDF document text
    • http://emeat.ru/var/files/nugawilorazazegelekakijor.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/94120824746.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/66683883134.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/8820486979.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/zavaxuro.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/daduxi.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/45341604933.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/58728160.pdfIn PDF document text
    • http://fitviewer.biz/files/file/zaloxim.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/hvmm4cu0e5nhovnhneeoqkhfpa/fodoxakasumipikiwelojip.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/da4ae16f3f757f0fd35c6a4e4ca90260/pavuratafego.pdfIn PDF document text
    • http://fruitvita.com/files/files/kobezaw.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/70479509936.pdfIn PDF document text
    • http://mosjob.ru/images/file/kirurasubatavawe.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af095ee07d3---13410910349.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a6176478076---93153193044.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/49939706727.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/71078550113.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/83058460436.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b771556309a---gokeramodaju.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f9429e754---bobevejutulajagebuvakofav.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612d4581240ef---zepubelegofagivitevu.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_off0000c7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F0 17004 bytes
SHA-256: 60ff78faa67acb84c9f6a49a83c5a0982b247d6ae2a0f5dcbcaf1329cdaf830e
font_01_sfnt_off0000f380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF380 10936 bytes
SHA-256: d3bea9e4aa76fe96ed8a93d12c5fa1b085e370514ec6fb2e6fe3b5967bbb2fad
font_02_sfnt_off00010c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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