Malicious PDF — malware analysis report

Static analysis result for SHA-256 65cb498b647b0d6e…

MALICIOUS

PDF

176.1 KB Created: 2021-07-13 15:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ff19abce79f1d153042daf9debaa2b8d SHA-1: b2f6f553516b3cf4df048b6cea319cdc73837096 SHA-256: 65cb498b647b0d6ebcc2256db152fd407b7388322d9f807ecef81344b380fd7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites and other disposable domains, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9122

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 https://krisoc.ru/uplcv?utm_term=lot%27s+wife+looked+back PDF link annotation
    • http://aimic.com/userfiles/file/radigizelob.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/dupegivukegumeduzif.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/vigimimoledewexu.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/cf11d0513aeb713a7bcd833d72fc9bea/vubigejipul.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/0c5ced95cbf28bf164135d8007322907/nujebolikedopurozoxuka.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/32840791356.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/81cb345243991696b456018ff1b1a41e/rujikuguwafiwifafonesomoz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce49d89c20---xudesikaxime.pdfIn PDF document text
    • http://1982thsreunion.com/clients/a/a8/a85c6617a93da1462bf6c3e7dda9c043/File/paxizafokepumijo.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/247248a968e0f9a4588662578118b0c5/pajubisitakeduzov.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/fusegutisalefu.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e0e6d9369---42042369877.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/04c0c2278417746169678d77e3916bf1/zupugi.pdfIn PDF document text
    • http://stratford1980.com/clients/1/19/19838be1bbe5684469623718d5e25b5d/File/41415115849.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/80039885921.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/c87qbcm7qv9ene4kqmrsv1a9v0/nulisaxotupib.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081f23035946---zirugufunu.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/tixelofegomarikokugolamuw.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/4660b88b2171bd21c0eb4d27a5a19a7f/12590775066.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c174290f50d---73413442225.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/bokirivup.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/mixusajux.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/3743267557.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972a253c240---67038937654.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/fonelitaxubipapuxeniwas.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/vowis.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22081 10572 bytes
SHA-256: 6ac78c5dfb8f50e7d3420b3886b1b4b9e580e4b74263472eac7b47c83ae45dec
font_01_sfnt_off000238e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x238E9 19244 bytes
SHA-256: 97eef27346a50f9985646c50b809c5302cfc1bc41f519d5b7e72c8d2c83ae85f
font_02_sfnt_off0002597b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2597B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0002718d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2718D 26488 bytes
SHA-256: 26ab91c49acbc143d8ea32c34996ec8a86edaecbfb673f32e9837cd13f8f3b91

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