Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a203099f036f443…

MALICIOUS

PDF

79.2 KB Created: 2021-08-17 02:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 8b82343a92583d021158ab66cfb0fc4d SHA-1: 4b231f3e14646f8bee7397e09dd6b130cdfee727 SHA-256: 0a203099f036f4435baec6cfab36a845f8238433312ca4f9bd5c380dc0444b90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/4e8b73b667cd12140c271bb8d9b69864/pedoxuditukovidifas.pdf In PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607be5703f494---patadarisedo.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/eioil74bpr3n0lukfeofivh7ib/24577810711.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/kirumax.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e372ae6fcbb---13442839037.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/vexofedotexenubimovojuriw.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/mopuruninumub.pdfIn PDF document text
    • http://puppiesulove.com/clients/7/7f/7fa6d7836ea929643a3c23f4562b158d/File/83871854969.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/867b07028ccd27dbef2ec005ede481ee/gawebadixelumaka.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c78762dc342---20742243207.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/rojumofofotukifiw.pdfIn PDF document text
    • http://maybomchuachay24h.com/Images_upload/files/20941546235.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/varosa.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/zufenale.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/0738002ee75abcfc87ff8af6fb0032ac/44960644617.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/15464536523.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/pemavok.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/192649164afc8bedf6ad9eead4b425bd/sipalesozisutoruzovaxero.pdfIn PDF document text
    • http://esistore.be/userfiles/file/madam.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/tokitomazafide.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/71371853264.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/xugigikepixasoduriraxe.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/62764463475.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/gavoraroposajimunibekonas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=compendio+de+fisiolog%C3%ADa+guyton+13+pdf+gratisPDF 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_off0000cd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7E 11372 bytes
SHA-256: 1f8c20ac4e95e329a14740d813ea4cb59afb3dc83b3ed6a227e7566a014aa969
font_01_sfnt_off0000e821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE821 17192 bytes
SHA-256: 74ea3c506c2cadd5fef19a23c014736ed75e4399e9940e1dfdef9c28f07e2c9d
font_02_sfnt_off000113c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1