Malicious PDF — malware analysis report

Static analysis result for SHA-256 da765debc79b8cad…

MALICIOUS

PDF

103.6 KB Created: 2021-07-06 11:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6928adad5446b20852e36edabc5b7423 SHA-1: 530d935e3b5ffd3e3502c27f8776ccd395a6c7ef SHA-256: da765debc79b8cadb2cbb13cd158e2161c230ee4eb6e9d335ad8c858093803da
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable domains. These links likely serve as a lure to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13147007671.pdf In PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-6/20210706094924133597.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/d2d3868e31e979a4b2f7bb2bb45d37fb/kobesobujefuvarumiwasudup.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0edd94933---1761770619.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210623090622.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/55d64a918c0b39a807dcb312e42c2261/sevuxuk.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/36677708845.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/vebojefutudebotonaw.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/94649782122.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d74645ad2c05db9eb8c099aeb96aea6f/4234824697.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777c992ef16---jovokiwodo.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b302dabb6d2---17955591664.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d318af2bdf---37705931531.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ir6g9jds662jmnc2h44buqcpgs/78916896200.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4c053546d000f20f13d7fec0b9f20035/81677336467.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd5911cf36---wokur.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/fvaunb87enj9bu0jtdgq0dtu1r/63755065895.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/visudejegiropusosixize.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/xotenevedexipalusitupo.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/lofovogo.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/32157588265.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43844f4182---bimizurekafiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=inbound+marketing+strategy+examplesPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000131fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FE 17248 bytes
SHA-256: 7bd9c96f1ab90ed7cf4dbe897dd3185135ba782f1d81172574204602694ff5c9
font_01_sfnt_off00015f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F21 11232 bytes
SHA-256: ef22aa2e62de566411127e611cdbc44bea691f5ea125a8aadc237efd8a8a16b5
font_02_sfnt_off0001790c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1790C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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