Malicious PDF — malware analysis report

Static analysis result for SHA-256 b978d9e21fd9d9c7…

MALICIOUS

PDF

95.9 KB Created: 2021-09-19 13:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fa165978aa9913262a4b815a08b5963f SHA-1: 51e1b02b620816a5dfdda46b4a96a06d8e9c5edb SHA-256: b978d9e21fd9d9c7431bfef58ec576f844048b9a138e71ed7ebeda18a952e16d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to obscure the final destination. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent, likely to redirect users to phishing sites or download further malware. ClamAV also identified this as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=instagram+free+followers+pro PDF link annotation
    • http://smcertificationservices.com/userfiles/files/77636609006.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/rekawumesed.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210915174612_0eofx0.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/17722084958.pdfIn PDF document text
    • https://successalpha.team/upload/files/taronan.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143aaae64cb9---nonekap.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/77153543867.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/88290849426.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/72dvgluesh8v5b228ukgrtcjr3/wuxawesezomowivibunifigi.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/falezozoguv.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/divinivut.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/90138119791.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/netewote.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/jexin.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/47244682958.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be7ac763b0---58465749747.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/91108272635.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090504331670554.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/jasefivezijul.pdfIn PDF document text
    • http://freeski.hu/freeski/file/xiworukurakawugudu.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/43076753289.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613320ec0db86---jebikuvaboruduv.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/wosekogibezixofigomulep.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/94276553176.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/ruwavebesepi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11141 18444 bytes
SHA-256: 07292759f0f2d6b76ee40a69bb4fc103e1897c2b7bce84048643eb355f4de178
font_01_sfnt_off00014151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15968 10648 bytes
SHA-256: 8ab57debdd440ae8134a4444f0acba4fe1a6d7163e76d516971121f664ed7784

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