Malicious PDF — malware analysis report

Static analysis result for SHA-256 289542e94370f10e…

MALICIOUS

PDF

91.4 KB Created: 2021-06-28 00:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 33546af589dc7bd72b83a082e18d989a SHA-1: ca81764c1167b423a08fb004751443f58592d0f6 SHA-256: 289542e94370f10e0d8d1f23bd8e76d05322ba7324caf63a615e61b97679e241
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 functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites or disposable domains. The presence of embedded URLs and the overall structure suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://crysiq.ru/uplcv?utm_term=romance+stories+and+choices+mod+apk+android+1 PDF link annotation
    • http://nail-free.com/ckfinder/userfiles/files/dikowufetafigox.pdfIn PDF document text
    • http://acgroupenterprise.com/userfiles/file/83639392623.pdfIn PDF document text
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/nikizekot.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/725251f81710fec0b74d8023031d0a84/vilujegigodenobep.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/gk5blkvnge3aspv1gadhko6mo0/fibubidixafaxevovimironu.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/kurajufexivigut.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/681c3ddb042ea0553930bb0d51220925/murelixapelofa.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/f2fffb6f645ce19ad8d478064d8287f5/58159396143.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/2nqr1gt4hs5se80qoe3t7bu1l0/42787002322.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/resalino.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7122412e3---mixifutamababifusobikej.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/78001bddbc2784262e7fe64d88fae493/logikuxonesezizulezim.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/513871fd7a3bf5674d3a7d86ece71389/63298479580.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/30795081919.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/xutumifatuvedig.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/gugagolapebusadetamexe.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/91df6827d780cfef40913e1fc05336ca/kisonuxexutuvaje.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/xupanoxedijogakogajego.pdfIn PDF document text
    • http://wamer.org/userfiles/file/46160018056.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/lbtdp8016akl4av6ni08o8e1h8/firenunezezogugadonajob.pdfIn PDF document text
    • http://praguetransfer.com/files/file/16297865113.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087280105d39---9814134193.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE416 16256 bytes
SHA-256: fbfe2933e9331410d94f34a361ebcd739917d9aa76f9a8e517989e41dbb2cf10
font_01_sfnt_off0000f9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EC 10924 bytes
SHA-256: f3170c3077d2d88aa602207ced6b3b5709cba3b979d12cbfd3c0e6aae4da2ff4
font_02_sfnt_off00011311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11311 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_03_sfnt_off00011b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001332b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332B 16896 bytes
SHA-256: e481d197bb9e6572fbc6a419a7d4233653fa87947daa84731249925b6da430a9

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