Malicious PDF — malware analysis report

Static analysis result for SHA-256 77f24d645cabe147…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 15:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2f3ffe54b2ea6b28eeeb973d96ca497b SHA-1: b49d8fe4baa1c68f13a0c33d9c5e73b2ada670cc SHA-256: 77f24d645cabe147dcb8de451e50edaecca5f7f23557cf024061cd3f5a3913a5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or utilize disposable hosting, indicating a link farm designed to direct traffic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dolphinsolutions.net/ckfinder/userfiles/files/11717220605.pdf In PDF document text
    • http://dorrstrechy.cz/UserFiles/File/desibu.pdfIn PDF document text
    • http://chinazzjx.com/d/files/55451018026.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132febc9a22e---94132320975.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/vimovok.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/kilofavomaxa.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/molixurezajawog.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614064a89e76c---debisib.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/zokewebeberivo.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/sifajaropo.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/tevepunowuvozidovimififet.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/vilosesujerunep.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/o1t1ugknr6vsgdhcpje72pbks4/sanegeguxiwupotijumuk.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/23062204299.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130b4c088575---rajamivemafojew.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/lebatir.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/runilesupifage.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210913_230947.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/tesezaravebotanani.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/jadeliravadal.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/42223385535.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/nimusazawo.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/59c84a43a9aff68c8bc7b996e915029c/geselenizokep.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/sudebezisajurepinoti.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/kilekanojuribepokoxem.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5957531a2---dazagarebinefaxuvig.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/5802701994.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+font+weightPDF 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_off0000e29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29D 17244 bytes
SHA-256: b54a99da3fb655dbacc9a390353cc09c2f01140a531edd834f7d4f8a8d4e840f
font_01_sfnt_off00010fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB3 10324 bytes
SHA-256: 20d68b5a49820e21ee9d615f12210cb8f1439645d9a0403e92618b023312fe26
font_02_sfnt_off000126bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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