Malicious PDF — malware analysis report

Static analysis result for SHA-256 3def5bf8cd4c81d0…

MALICIOUS

PDF

87.7 KB Created: 2021-09-06 07:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6ddbebe526e40055e65eb79fd36a83fc SHA-1: 4b4446d8fb8edad7cd299a2edbdedb30edee1fbb SHA-256: 3def5bf8cd4c81d067c28cad375e1740602be42b95a06c689c0a763be5421441
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious. It contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=sc+roadway+design+manual PDF link annotation
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6be62769c4---61280915051.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfade94cf4---53093024473.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/27407971261.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d331bdb45388d37e3c109ff87ecff59e/46353589474.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/bbcvgurjgt91gbsd3aj1ii0vt3/58919919552.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/33ragivu1kn1cpv4vs2j5hjp70/tofudabobebekafur.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/wuropufovegivizefotuf.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160964f4fac23d---71466172488.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086728f90734---92666197875.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/22452615501.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/datate.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/74986445045.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/mufira.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b700da6f6a---64934871120.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/xabowiferefi.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/coe33vrb2hvqqn3sbdgjm3guvt/12648150810.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/defotanoteduvikalinakofo.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/da744d443048cd81d58bc5b052c7e40f/9462842910.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jmrdfltbdc141m2i9apcoesh78/12196170830.pdfIn PDF document text
    • https://netpage.info/userfiles/file/gudow.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074476614799---31790704447.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8b2bbd7a6---tuwavesokiti.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A2 10992 bytes
SHA-256: 9d1dc18ce649665bb9303903c2fffc07e8a645e6baf413d510309f13b3290005
font_01_sfnt_off00010bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF1 17620 bytes
SHA-256: 0ce1d20a9a55e98deffd3a415f2acabca2ebb0d0d405f8451b386d87caafba86
font_02_sfnt_off00013988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13988 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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