Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2d0233405260f08…

MALICIOUS

PDF

104.3 KB Created: 2021-08-18 00:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6eb7494b7daf402b755c5e8312fd589b SHA-1: 78623e855f4c1b9cca1050badd5f38d0e2ca1abe SHA-256: c2d0233405260f0808d4cb32cc2e7361b53427daec0138b6c0c8ba9c87fd9ea5
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://stlnsk.ru/uploads/file/44484820036.pdf In PDF document text
    • https://mnlex.it/file/66999296774.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cb26e2313---80795243058.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/sifanadeje.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6048dd3983---51274119984.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac68f1aefd---fuxupuw.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/81431246353.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/banubifasefuwariratul.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/nofipigodivanixepakiganow.pdfIn PDF document text
    • http://health-bridge.in/upload/file/13799373342.pdfIn PDF document text
    • http://darec.sk/files/files/62419429588.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/jixuzobajeduw.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/37998138809.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///guvewuzenewupewikapopuw.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/75751555085.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/lefimozaje.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/41653098141.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/ne909ch9rtml4pqsn6ust8o6a1/sobadodoto.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/20215101859504680.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/18274174628.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/diguripajezonem.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/vi2brc70nqp4c5pdpki7c6qo95/bulewogitubenibuwapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=reading+comprehension+texts+present+simple+and+continuousPDF 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_off000133e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF6 17156 bytes
SHA-256: 3524ae365cd8ae5bd77329d99c51f19d99a97144e1a362a0d2e56246ac038234
font_02_sfnt_off000178d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178D2 11208 bytes
SHA-256: 2974ed64449082215c5cd6d2a026a9b80de2cb34d81340a8bbed2d329efc3e35

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