Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8213588cb75f072…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 08:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 42dc0e4ea33188103bb6472d849572ea SHA-1: d0e14c565e2cf0d97a4efdd73d60a3e23dc2f14e SHA-256: d8213588cb75f07258db785e0f0fcbebb0daa47b84aee577b53d66781b2b285d
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious destinations. The presence of 'utm_term' parameters in some URLs indicates an attempt at tracking or SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://garglob.ru/uplcv?utm_term=getting+started+with+spring+framework+book+pdf+download PDF link annotation
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e9477fa04724929410463d894533b509/47868276708.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/43985297129.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073294b2f3cc---56037485677.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a630426c4---rejuforanuxiwupelazo.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/36164948692.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbd2d2c62d---buziwaletijezuw.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/85487ebb7faeb425edde4bafa2112b8a/vuvuzato.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc4455038a---niguki.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/7tq0qclk8nk6rndvjorq66nihs/topaxepikezijutozeguw.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc306d83a---vefedemamopug.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/2gclkqfa3n3os861d1iafbre7o/jixuvexewonem.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210905/210905133448709748dmxdnx3vtczf.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/5084641589.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/pasezaxebedisid.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/vugoxogigi.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/61659790989.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1610ff8cbaaaca---juvawidomewonetiseres.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/49d0d44acfcf505f70ba57f2159342b5/laxedexepisepalati.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/983c34c074e9e71f0f6a343460fb66c8/fogamutokamejate.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/28a809802842de0303bb8be4fee48b14/49466670636.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/tezelowuluwofa.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2d3a39536---69398007408.pdfIn PDF document text
    • http://e-hematologica.com/users/file/xesez.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/25016246175.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/powilimuvejavefe.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/60387591755.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_off0000d6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D6 17564 bytes
SHA-256: 4fe40a718e4536b58eda45eec704b636a8e4e0387b1fd71db2fc745ea23d5a0d
font_01_sfnt_off0001040c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040C 11300 bytes
SHA-256: d0ca4ffc13d0956229f6202372cce074d99d26927a3e914702666ff4b1ea3dd9
font_02_sfnt_off00011e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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