Malicious PDF — malware analysis report

Static analysis result for SHA-256 fba58ee119880432…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 07:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c4829e9264166225440e05f51278c1c0 SHA-1: 908ba263a7f9ef8237c56e55affd85d5b37c8164 SHA-256: fba58ee1198804325e6bc913333ee5c271156edf4cf2d2710a692ec0df423450
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to lure users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of game-related search terms in one URL suggests a lure to attract unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://pc580.cn/upload_fck/file/2021-9-3/20210903224825105097.pdf In PDF document text
    • http://vibrobeton.by/pics/files/6334333084.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/fokobunakinolodexunijogav.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/36398806675.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/34940370260.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/zewimovezironirubakasodo.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/pinudobetidugubobaboripa.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/luputotipete.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efad203f64---lemabenit.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/80167399588.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/67330012942.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/muwijinogopajepe.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbe99656bd---dagez.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/66796883175.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161342763b9dfd---49119470414.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/bukamegegut.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/45145916388.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/17376674404.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/jajibo.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/42600320496.pdfIn PDF document text
    • http://trivio.it/userfiles/files/gejovoponipe.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/11432809966.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/16926373029.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/kiwewizefisuvapemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=naruto+senki+fullPDF link annotation
    • 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_off0000e12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12A 10376 bytes
SHA-256: 809da3fa6b1f906699d95bb0f7bb5bd1ad66b01b77b250e18ae16cba826fc36b
font_01_sfnt_off0000f8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 18148 bytes
SHA-256: d7e06899f0c5a216f4cfc607f042aaf95d569c675a653d454a927b15829c5a8a
font_02_sfnt_off00012813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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