Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b3efc6ed042646e…

MALICIOUS

PDF

91.0 KB Created: 2021-09-04 00:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6a27b5b3ce4a506c4c8ed77eb2d60995 SHA-1: 0fc20af3354e0a19a90b52b7d2fa45627692df32 SHA-256: 2b3efc6ed042646e7e2ae188974cfa261ef6c075beaecabb46e87b8b1c73a4d6
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The heuristics indicate it functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. These links are likely intended to lead victims to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://huntic.ru/uplcv?utm_term=politik+pintu+terbuka+pdf PDF link annotation
    • https://acronimocostanzo.com/userfiles/file/95246935668.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/336afca1ce2c38c55c2b3a0ce5587117/tidojefuxod.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/cc79a0e7b99bf7818519b9c4ad3471e3/39073758289.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/xorufodibile.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/pinedukakasis.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/fofekojodebevev.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a653a3422---58090496585.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/8f40151f5637e14feceb172fac23939b/zedexifonajumelepevu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32dc690c0---remunibeke.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/gasidowadirekatowu.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0fabd2fce---29094055728.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/2845478821.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/zijusitotez.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/19314132981.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/58952007785.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/57979754164.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/jhecsknopreq0hs547m1511dor/musikilevudog.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b9602dd13---37322820431.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a605ffc8d84---ruvadexodubifulakom.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160efd54cc6946---6526248403.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/gimm6dl5136hivcifsqqbh44i3/88108961365.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/bileneku.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_off0000f2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BC 2728 bytes
SHA-256: 59d6cfee465c568115ce759f16bc39e6c239585ff61cac5207cb546406e15468
font_01_sfnt_off0000fdcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCC 10656 bytes
SHA-256: 2b4e155736707bf4f4356a5f1e04d330914e17f73dfa456265df415cff19aae1
font_02_sfnt_off00011613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E25 17980 bytes
SHA-256: e0ae2b5d3ed09c93a753b5611f0783bbc5c957ffcd4b9750f4a7a0ecd5b57306

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