Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a83689bb21228a…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 05:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bd6ff8d2fa40f4519d4202bed3761859 SHA-1: 7e0db49a0061139ae8f15d00c0c2192431a9890e SHA-256: 36a83689bb21228a26ff2cdb15ee199db3d01649413f3d4e99677186c1f78637
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting it's designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators further supports its role as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=protecsure+equipment+pdf PDF link annotation
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/7b19f117e54939df6e8faf5be6c8eb94/33216310134.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2bcd89a5c---zubelodafaxalupaxik.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/84815081966.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/10932458506.pdfIn PDF document text
    • http://ipceurope.com/assets/file/kasurimofawo.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/24211240993.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/57188004855.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0371b054d---kisar.pdfIn PDF document text
    • https://drsaman.com/files/61349901126.pdfIn PDF document text
    • https://rasorestefano.it/file/39877631771.pdfIn PDF document text
    • http://basketaci.cz/UserFiles/File/16892497787.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb090b9ce20---terobigosozimiwu.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/83278247176.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/jugonafinafibajuzapesixob.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/66965125501.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/35349422009.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/nipev.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/dizaxawojunubuwez.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/ab62c14c10f703dd54518ad7821c964d/wubot.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/zajobapunekisusuleta.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/bukoxirupiw.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/4854897643.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f444be0404---rarogigitilaveviwukixiw.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/xugeki.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_off0000df6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF781 10820 bytes
SHA-256: 9bd2a07e8d78b0e64777c582dd38bf0b351263ff876ffbd69854ce70247f9b88
font_02_sfnt_off00011039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11039 17720 bytes
SHA-256: 1a6fc02c7b982080e00dbb68c80732bbf262487e3d4c12693149acd2e4f7e78d

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