Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc911def23d169c…

MALICIOUS

PDF

75.9 KB Created: 2021-09-05 06:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7efcee717ad6e68ed625455d8c69cd1d SHA-1: 94835ae5c9c5525f95461dafed93a82d70617b04 SHA-256: 5fc911def23d169c0572239b07fbb4ffb3ed99da139801a24b06d75429878ffe
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content or download further stages. The presence of a 'download button' lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://arcos-eff.it/userfiles/files/deguj.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/ad3444ef45289a9ada919c25f1b6828b/makowuwovijajolos.pdf
    • http://envisystem.com/upload/userfile/files/39663345465.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cffefcc9eb---fobigaz.pdf
    • http://geometrabottero.it/userfiles/files/salekibizemasodisunaxija.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e29bdacea3c---87707733690.pdf
    • http://canadanur.com/resimler/files/87216861439.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160717e2e27efa---zanalofiwasodom.pdf
    • https://polenhosting.com/calisma2/files/uploads/31804154925.pdf
    • http://loveperfectionschool.com/upload/file/40221218918.pdf
    • https://3drm.bg/uploads/pictures/files/jatotevizuxudovabekiti.pdf
    • http://9meclinic.com/ckfinder/userfiles/files/52255095033.pdf
    • http://tuning-zone.eu/userfiles/file/76902837362.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f874a59d28b---70422454995.pdf
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/bh7htdufbq11u047ncrr8hrd61/23138675239.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160840e8a06266---7459426413.pdf
    • https://woodfur.in/userfiles/file/14959964849.pdf
    • http://tl-maskinfabrik.dk/userfiles/file/67070971020.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/b7580a93e85a3e8bc9bcdf4938bff9b3/7458934617.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a60f695b3c---jigaraveluf.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607de34b5f5c5---34253057022.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef3bbbb798---25425211272.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f54245594---xulosej.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=theory+of+cookery+books+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcf7.bin
6bd17bdfaaa5b9c422692ae55007bb0f5095c0206c7e9cfce3f2a88feebb3a82
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF7 10524 bytes
font_01_sfnt_off0000d4dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DD 16792 bytes
font_02_sfnt_off0000ecef.bin
e69bc5c7b372f0f7c479f9709c691b7c08450e648116313bf2680b37e5ccb3db
pdf-font-stream PDF embedded font (sfnt) at offset 0xECEF 20860 bytes