Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce6d9712c50cbab…

MALICIOUS

PDF

71.2 KB Created: 2021-07-05 21:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e8cc080e64a45f403f82e07b7a86975e SHA-1: 6882669a9c8c2bd344e575a048879087d7436519 SHA-256: dce6d9712c50cbab73c73760d8d61e1bf4ad2fd46aade5de5d0b8809e36b2a7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates an attempt to manipulate search engine results or host malicious content. No scripts were extracted, but the overall structure points to a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://archism.ru/uplcv?utm_term=free+videos+of+women+with+big+boobs PDF link annotation
    • http://www.oiseaubleu-promo.fr/userfiles/file/paranalafaru.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608373994f2bf---pezijijovawejimezimikaw.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/wovomexakinowugezezegon.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/oame3p5j2q2n9sm0d03tbcv95r/22779586140.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/6512bc433965a429486c63d45faccfe2/gogilon.pdfIn PDF document text
    • http://abpaluso.com/upload/file/40581299413.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608c04ec92c68---8262700053.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/2319f023cd31a395124c12631d4cad21/dejojawisigogajanet.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/s83df0cnsqq6746hul55vjru56/nenitavokamebefovemid.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160783d1ed5ac5---tiponiduka.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/6a1eee8aae7b79e2fa4cfc9b4dceb9c6/muwekezokepir.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/dapifudufadewaw.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084b70b4adf6---javokebux.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/pixubom.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/1e2v4blkhpfqu16i0cnlr9o0s8/desizojonibevegumobunef.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0473784aba---bopukadurimusu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/26862251698.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/47879612887.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e9fb48b8a---lalitojiz.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/rojozolizekusul.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/3a131ef597dcc3572a9937d6a5aeed9f/sebolesutiganuvo.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd63f024e9---10544487424.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/9f8d93c37ae985020689ce66efb1612c/zajavanezovekifusekulo.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/99bd57b2baca2c7f5b2a3d82b366c3fb/65496497500.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdc1d226d9---baredobarusexabu.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_off0000b907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB907 14728 bytes
SHA-256: 1f31073044fc35c1538d4df66479618603013c61f5f41a1af7fac11ddff48a5f
font_01_sfnt_off0000de5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5A 10864 bytes
SHA-256: 948bfb96dbae3f33e0fd6418ba0bb70c28aeec7c9a4d040e160e682dae856e2f
font_02_sfnt_off0000f712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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