Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cc633f478f8bd4d…

MALICIOUS

PDF

91.1 KB Created: 2021-09-07 07:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7c6da31bf51f640ed67148dfd79456c4 SHA-1: 72122d1af3fa0f4e2f38c228b79114f6543b9a3d SHA-256: 0cc633f478f8bd4dd905ead421bc3b53a26d47ea77d0620a5a0f45f135a081ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to numerous URLs, many hosted on compromised CMS platforms, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9777

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=irig+blueboard+manual PDF link annotation
    • https://traveletrust.com/basefile/traveletrustcom/files/jilujijibobubamiparano.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/vixokefemigolutorotos.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/besaloninoxiz.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/1e2f0d8e2ae5baed32d79ee2c9eb9984/nugopimof.pdfIn PDF document text
    • http://geotersrl.it/file/28368752565.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/219a7fcfd43b5c046a121a52483ba6ab/68131049359.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/garafexusifuduguxenefewi.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf356c6577---jogag.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/da9tfm6h7rdrll5k285s2qa7ba/29483930427.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8a8e183ac---balipugexakumosemeba.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/31763962336.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b7slvvrncqppbgabiq25id2d27/pixemafawexodimezid.pdfIn PDF document text
    • http://deryalvincotokurtarma.com/userfiles/file/zonafipuluxakuxegufija.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/23389953452.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/bovefolotiwodikalopesirij.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/76950866962.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202182580363227.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/zogewukebarux.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/pelixet.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab594de3106---11922564823.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/pajadoluderugewefidaduke.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabc34daaa---kaxapusorimopimuxeduw.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/2651723044.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/dobezoxanano.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/81221050389.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210703024226.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c62e9f591---84102103279.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/add25d7a7571f94c98cc439a01f4b28d/tofujadasatogosewidapaz.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
stream_004_off00011409.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11409 16996 bytes
SHA-256: 778463b89847028ef411f37b67a18a2ba0b1c33cd67411f79f0f7f6d8ad6602d
font_00_sfnt_off0000d778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD778 23540 bytes
SHA-256: 57e4463964e79a24b5c6bfe752b320b1e39b6abc7e2615c84defaaa699d95acc
font_02_sfnt_off00012ceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEB 10516 bytes
SHA-256: df3a50ad90144cb133335b06e69d8f6700292d9bdc0f952bb9c253a443ce313e
font_03_sfnt_off0001447d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1447D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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