Malicious PDF — malware analysis report

Static analysis result for SHA-256 451644412e5d373e…

MALICIOUS

PDF

95.7 KB Created: 2021-07-08 05:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2fd17129762a24436e38d1889ddedd1 SHA-1: 04c28d5a0f4ffc6363c6804092f1f89150c719d2 SHA-256: 451644412e5d373ef1577724688fd3d2cb4ea7445b03587ca15ca2ca040fa26e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong intent to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inwebjor.ru/uplcv?utm_term=list+the+12+disciples+of+jesus
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ad9346dc6---91817605185.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/hpjggqhlgm2ss66hokem9vqns1/8099899790.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e422f02b7---209028962.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160822de70de8c---dirudagepubokofazanexibu.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607669d045bd5---77367724492.pdf
    • http://aliglobshop.com/userfiles/file/50516923382.pdf
    • http://siripanyalamphun.com/user_img/files/23598309004.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe9a853673---17218019198.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160713e63acd8e---14621944182.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809902bbc0e---68151916031.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc642f2a950---kotetekoj.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/7h902ol0vomg5pb74qas9n0gj3/59047905391.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fb13aabc4---jedemototi.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160831ccae37b0---79257608779.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7abddc4a8---50070492261.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fb21d9f9e---nobupivoz.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ce23131efe2---27573398664.pdf
    • http://lateonsettay-sachs.org/userfiles/file/13339614132.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607452b02f655---konokedizoberurilamupogok.pdf
    • https://weddingitaly.jp/images/file/58341344989.pdf
    • https://atkarisuli.hu/userfiles/file/49720081269.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607195df62cd0---73016834295.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/11b2e58830d1b1cbddb5026374223467/35085770490.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30b10b2779---75520130345.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112c9.bin
4637585839644cd87161cb5e1e6a6ccbb78d9c0aa944a4db4e09bd5cfaa8505a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112C9 10712 bytes
font_01_sfnt_off00012b89.bin
8c4f0706a130ab34ce4b50708d7d9d7f3b03f6ca59491f4065f8839559cabb4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B89 16976 bytes
font_02_sfnt_off000157bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x157BB 16792 bytes

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