Malicious PDF — malware analysis report

Static analysis result for SHA-256 84bdbcbd72e41838…

MALICIOUS

PDF

80.7 KB Created: 2021-09-09 17:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2e2bb176f52b4cedbd94da802b17f45 SHA-1: 4f3c45e4f29faab2bccfc8796b40cb4fb3675a08 SHA-256: 84bdbcbd72e41838c7c7ec51afea1baeaa67b6acafadbd68b4ca819d8e9e4ab6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised or disposable hosting, characteristic of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gbfrjournal.org/pds/userfiles/files/41956047362.pdf In PDF document text
    • https://pierrelemagicien.com/userfiles/file/54944558748.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/pivawokokasematunojixajes.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/lumukeniwa.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/26825308819.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/83477594159.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364b442e59f---vozobizegonurexisu.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/nozudepule.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/viwopudejuwefig.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/92350215638.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/sokebobafujaxepe.pdfIn PDF document text
    • http://hoachattn.com/image/files/7442978132.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613933f977d8b---47384868492.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/ff3e3ee6ccfbe970d397836c2a1f3863/teziv.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/32186701266.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/r434o8kealku9353u5blpqvqkt/12259349559.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/74507317004.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/96882125675.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/darekizenefovor.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/xiwilaxumudidu.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/93267654577.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/zotukafedajazezasar.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/64520851506.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/zakuredizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cheat+codes+for+gta+5+phone+numbersPDF 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_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 17892 bytes
SHA-256: 6ad8e8ba7c4323f263b17a8565fb5e9011cdabd8d616bbcd6fdb487f9049ee2e
font_01_sfnt_off000102d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEB 11336 bytes
SHA-256: 39a468bc1cf77dd35ae18ac0c0f0c7369241ce975cb2d97f4a8f09a1394199f0

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