Malicious PDF — malware analysis report

Static analysis result for SHA-256 68816073c1f7ccc1…

MALICIOUS

PDF

93.8 KB Created: 2021-07-06 19:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d76799fff93dfd0019f422bb2215abb SHA-1: 103dea949102326a9d43c469bf80d3eca2442875 SHA-256: 68816073c1f7ccc1cef30f4cc4a49169e214050cd663539570f27dafc5ad65f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The file's structure and embedded URLs point towards a spearphishing attachment, likely leading to a second-stage download or a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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=gcd+of+3+numbers+calculator PDF link annotation
    • http://smartpaintingplus.com/userfiles/files/97642187923.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/6s6u5chb5gjjnajnmmlv32t6k0/xeponugegubeja.pdfIn PDF document text
    • http://royalgroup.at/tmp/23061043119.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/f130b4fdf4c4816beaf10cfc50b1eaa5/23241158361.pdfIn PDF document text
    • https://blindnow.com/userfiles/file/86172583487.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/famabovobigilim.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6ade36542---73048899211.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3410cbd4ded7a5126ba4499cf1763ac1/62440310446.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160a50524318c0---nakufiti.pdfIn PDF document text
    • http://dhf-china.com/d/files/wegad.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fec2b854a5---tofifigetosaro.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/xivazala.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd41f7cbda---23776176325.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/mijumovifonodo.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ud277q0ikve38mn79e1v0mrao1/boginole.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2a081cff2---mufuludedozupinajipe.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe59e6cfc---gigixizuripibepekup.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210612_163615.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/gnvmkh6c2ni48m12onoufih98n/dakotezorivuru.pdfIn PDF document text
    • http://meta-min.com/files/kinolezemipig.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c08b3b0544a---daruwero.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/ssnpuf1uu45if0kk7g6roduv84/43025612521.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/66643052359.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b42a901be09---34472265130.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ccc372859faf79032567e48f0a7eef8f/tuwobami.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
font_00_sfnt_off0000f413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF413 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2A 10996 bytes
SHA-256: 3a066de11ca5af7d05c8c68c6e6daa58c2e40bf0ee2975627a0c7a7c8e990a72
font_02_sfnt_off000125c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C8 16240 bytes
SHA-256: fad5dacf09cd1b43314537240f9f06457f0671f261c0d1ec505bc4c7454e8b9a
font_03_sfnt_off00013b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9A 17480 bytes
SHA-256: 0063c3724f24cf76197300f1de7f3759c0c76e961f92f5f0fc84c3843779f5f1

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