Malicious PDF — malware analysis report

Static analysis result for SHA-256 8129b5093bf7626b…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 05:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cce20ed67cffb16d7961cc8b7df98c1a SHA-1: f1d2e25808e07c459448bdead0f059b2d87942d7 SHA-256: 8129b5093bf7626b3099eb37eb92538397b8f841cfd79f6b68b2714a76d380f0
156 Risk Score

Malware Insights

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

The PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains, likely intended to redirect users to malicious content. The document body was unreadable, but the heuristic firings strongly suggest a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/mebomagavat.pdf In PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161473826003cd---velanigerojenipelanopowe.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161468c7025dcc---97373083597.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/39129345727.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/55153234384.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/kolibesirosumo.pdfIn PDF document text
    • http://hnkingdee.cn/Files/file/2021948460.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/dakesuzofulogenes.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/jigutonezum.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/90023493330.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/30974041070.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141742ded9c6---judefabemamofumuxogez.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/fobobuzi.pdfIn PDF document text
    • https://irantruck.ir/data/file/jogipu.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/63063694717.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/xefigamikuk.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161410b92331a2---nenanonulabowapapikesinuz.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/rb7hvmv9jmpnitdasm51btfr12/44300796581.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/79678155135.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/polizujeri.pdfIn PDF document text
    • http://melabo.com/upload/files/76191465086.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/90897171651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=frequency+wavelength+relationshipPDF 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_off0000da92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA92 11140 bytes
SHA-256: cecbd80358817498b8105f16c6892fdda007705717ee5e43445395dc89a1da39
font_01_sfnt_off0000f444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF444 18960 bytes
SHA-256: fb4842d20ced89b6e0d0ee9892ac30db947bb4d776713d713654ad1dd93e670a
font_02_sfnt_off000124e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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