Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c9d901a9b6e5a9…

MALICIOUS

PDF

78.9 KB Created: 2021-09-11 16:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 67eb27ba74385fb21ee785e617a0b4a6 SHA-1: 9dd662ef0600b6e4eb21a6c3dd25160a0060d6a2 SHA-256: a8c9d901a9b6e5a9aa0c166a662c2563a17ac4d74cfd9a29b3741d6c27eab988
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The document body is unreadable, but the heuristics indicate a malicious intent to distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://mprime.net/ckfinder/userfiles/files/82844664378.pdf In PDF document text
    • https://associazionemusicaviva.it/uploads/file/juletebebuzokogela.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335c62a0cef---livupikojag.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/ratodakozaromedeni.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/86403785014.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9f4ecec7---82816837162.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/mutigu.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/43398821469.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be4b67a088---popuketesogerunupazir.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/36479378296.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/56218310388.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/xifozodavasuwimitiv.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/bofalufeviwuv.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/15267425308.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/savago.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c18121c5d8---87161987182.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/taduxi.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/jozulofafobexafez.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/80623343799.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613655aa528bb---siwizoziko.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/dukigabolipufavopexujev.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/tididuluwija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=good+phone+lock+screensPDF 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_off0000cd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD75 10392 bytes
SHA-256: 215b2fdf333c63991435303a16e066e0ba5d0391017423d0a7551f4f6f4e6e2c
font_01_sfnt_off0000e4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E1 19692 bytes
SHA-256: f96e3b51ad8ce1dd0a3c9c7f4b24bda74f539055068d71cb076d0fdc75b190f1
font_02_sfnt_off000116b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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