Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97310ec65b335d4…

MALICIOUS

PDF

89.8 KB Created: 2021-08-06 07:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 38a056439a9032a9307569c4cb4d955a SHA-1: 48d429f029cabacef20345d7c3d64a2e87b1da08 SHA-256: c97310ec65b335d41498e5254a572935a29716782688bdba4aa5f5b684d3c190
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://philabc.ru/uplcv?utm_term=skillet+songs+free+mp3+download PDF link annotation
    • http://laulumaja.fi/ckfinder/userfiles/files/2653809425.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/83a002c594f7c55f5cb079fa88d9ad2d/68955770840.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3981ac9ba4dab0fad5783cb8848ddf57/fofilofapipenopo.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/32d7a494c180bd9185a28026ec31a343/68540640351.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/nugusulexozetuzuwivaz.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/wolovavevun.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/55196537020.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/j90spr433qmkf6vuccttt6nr9i/4038511821.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/jixivufifugadij.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad68812f57---zajularebonixabuxirobipow.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094eca605fb3---kitefovudiratogiwerovenow.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a984fd59d0---bixodekobotogixep.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607133ca1bde0---jipalafefezonamizezomu.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/84465871929.pdfIn PDF document text
    • https://dprkoreatour.com/uploads/files/zazixilutanomoz.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/51092060485.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/jizasobonaliwuduvarox.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/suvewir.pdfIn PDF document text
    • https://amsteroverseas.com/ckfinder/userfiles/files/zovakonemosalago.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/wilukixiwameli.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/0733c9e097401a5eee69129eea657f28/xuradozuwozimikegorakegi.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/013a2e86cd4f7ad4f6298539e5d7e971/24373686376.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608454d78b2b9---66916824436.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/0cd9e660e4c4179e5aef1c86d1eb6b37/50913963992.pdfIn PDF document text
    • http://vtaky.sk/media/file/koguzeragelonamerusiko.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B8 17096 bytes
SHA-256: b5d6cb0667f42384e5bdd2dcbce0cab395ab235dbc7f06f6a2a93e960a0104dc
font_01_sfnt_off0001269b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269B 11268 bytes
SHA-256: 161b23d83de802f4e85b8d9d53d8c12bd10439a47f0e3a5fefd651aac0d140d0
font_02_sfnt_off000140e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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