Malicious PDF — malware analysis report

Static analysis result for SHA-256 261258dd6192341e…

MALICIOUS

PDF

112.3 KB Created: 2021-06-08 21:41:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 235c838de1b5aabc1157300cb7ab2df9 SHA-1: 77138653415b92aa008bb590713046263b119754 SHA-256: 261258dd6192341e9f8bbf0bb3918d2f7355c7269fcc481f3bd213828e1d4fe9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://cructi.ru/uplcv?utm_term=amma+kavithai+in+tamil+sms PDF link annotation
    • http://pc75.net/upfiles/file/1620895757.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607592870d7e5---fusafesovogufolotipevo.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbec744a317---2192940204.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/wegijujukevid.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609de9c1a9916---44548113835.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/9280861037.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/m304bm7su80i5ob6gvacrdjjuc/45972838285.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/4bb0kvs7tr6bt2le77s3j4e8ai/waderek.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jdd3g7ktdpgil1vg3tutophoui/vilunozakusabuvirexudoto.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070f8ddc914a---mobof.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/89ef3ec0f7eaf84a83078fde74d727e2/12177617418.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/zolesutogamarevopamu.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/qcmgohm9d5ngrm9lvb65icgf3l/3657403606.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bdc425b79---wegup.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/8a18530db08f328375f3df8bd79b9bd1/kolexuxividurizebosotur.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/74f506daee83ccf64377461df8061cb8/kaxalaxamevejerewifas.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011c7c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11C7C 26712 bytes
SHA-256: bac808c1d6bd693e5ba6f399fb5e4f2fa55e9010d022604c8ee97aff2a2115c3
font_00_sfnt_off00010d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D75 4500 bytes
SHA-256: 9561c6094c339c3af3d79d31db821b90f20d85c33ab0f835c8564818f3b9b5a5
font_02_sfnt_off00015224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15224 7288 bytes
SHA-256: 5c094471f2dfb260e7e1fbbae9f2331af3d47c1beaf0979b7ef57ec7d54dbf84
font_03_sfnt_off000169c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169C3 10388 bytes
SHA-256: c0e9a1983011ea7bf0bfac8e5088a6b242676632414d569217bd056e1c65f112
font_04_sfnt_off00018d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D48 16860 bytes
SHA-256: 834eca309d36bc9c610d3dd61510638366834244f0a5247cf8dfe804466e8598
font_05_sfnt_off0001a459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A459 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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