Malicious PDF — malware analysis report

Static analysis result for SHA-256 c07fbe19a412e61b…

MALICIOUS

PDF

73.4 KB Created: 2021-07-04 23:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4cea3323f99eba3f00cff0f89beb760f SHA-1: 3941570aa6e334beffad3cc5d2a717fc1b9a58ae SHA-256: c07fbe19a412e61b8f970b6a0a6b0aaf6c20ede1e0e09b62647a247f62aa5f8b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The presence of external URIs and the nature of the link farm suggest an attempt to lure users to external sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://abwmarlboropike.com/uploads/files/25934300856.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160708e75dbefc---pazelagafulixamoludano.pdf
    • https://namratalakhotia.com/userfiles/files/31095224916.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/06d0e24d8b6332a916cdc0b1d6d682e9/vanogudekolubapubog.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/bc83821b96cbe995fe36e5eaf89993d6/kuwasurapamusojirudon.pdf
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/4g8jn121pj55j0iq21jr5f13qt/xubob.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160809d6f6a743---wokizo.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce0ed0f73c---67838366262.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/f6b07b0fc368762162f475f33e095255/91838701542.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5f58fcfbc81b5fd5737cc189c3567bd7/43925430242.pdf
    • http://hrjok.com/uploadfile/file/dodipaxalin.pdf
    • https://area5srl.it/file/vanomidisusop.pdf
    • https://myphi.biz/nbloom/fckuploads/file/lajopebobisilef.pdf
    • https://schmitz.cz/res/file/daxefibikuferile.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/22848da91a518a47e3b3ee3ee3784f17/41285607907.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/6dd2bcf1b108468a3e56a0dae2fed035/99676459145.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/04de8361ecedddd33170d2963972ffef/wekezi.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/4a170c998761b50396db8ce7ae5fa171/33312836286.pdf
    • http://mousike.it/img_ins/files/86793252343.pdf
    • http://bioident.pl/photos_fck/file/dudotozigexepuwibezix.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/349384e2646ac93b35366bbbe6474e1c/sedomowisedixulovimegeb.pdf
    • https://hometeamcorp.com/images/usr/zamofewurixifuxakimuw.pdf
    • http://internationalnetworksolutions.net/files/janapezarawobopusegetiwet.pdf
    • http://arcomproltd.com/userfiles/file/sufuto.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=living+english+structure+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_off0000bcfd.bin
dc7dedb1a719880abdcca7ac2777338fc685faadfdaff4121da20bd0186625d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCFD 16668 bytes
font_01_sfnt_off0000e7e8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 16792 bytes
font_02_sfnt_off0000ffff.bin
08258cae936d2b9ba557ca8c70b965bbd47a9396c8d8730cd0838de82e0ff4bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFF 10740 bytes