Malicious PDF — malware analysis report

Static analysis result for SHA-256 d20e59a3807f68e2…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 11:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc457ad4be7d6194145548101f022351 SHA-1: e0e6561931bd784ffc8497796ada536f3e2fabc7 SHA-256: d20e59a3807f68e2285cdc01ebebba3dc95d7396b1eb5cf09a70d2bb89dd6687
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URL patterns suggest the document is designed to lure users into clicking links that could lead to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nhaccugiare24h.com/uploads/userfiles/file/kogejiremixumozo.pdf In PDF document text
    • http://cegled.varosom.hu/userfiles/files/rimivopo.pdfIn PDF document text
    • https://kawanmto.net/contents/files/61500543272.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/82412267566.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/9071d1e94f55f8dde20474348cc5f3aa/27027058166.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/fazonuligugoxebebopo.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132e7da88bd6---39184233883.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613676cd6d7b4---70373669817.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/woxujotepig.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/suximogaxewum.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/kulujuxolupimiwifov.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/pumutarasuvejaga.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jrk03lq31do1abg2cugbv2i7i0/mebasabuxusov.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/93986394506.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/bewizutaluwasimoluxolerel.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/d9nrlf9b6r0bvelh34tkkdpvpc/kuzotelosozatinasoxogaj.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/sexewufiradazulabo.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/zesidenozutapenudizubekib.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/ka392u90bhi92281gv57jpa6tm0gksf7/56199571261.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161312d8e468e5---vikawozesike.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/66361254798.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132f017810fb---68130761827.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=imo+2021+apkPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/tesenosofenasokufenojife.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_off0000d93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 10008 bytes
SHA-256: cbf16fbc67ecad1a6d572116dde04599385d93e91fffb5a704d9ff238d2181f6
font_01_sfnt_off0000ef7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 19124 bytes
SHA-256: c1d2003ccb681fdb8145a35ce0a930e9c495419b991ed22653770e09210bb901
font_02_sfnt_off000121c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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