Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97b04398a2c5ca0…

MALICIOUS

PDF

87.9 KB Created: 2021-09-08 19:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cc4d0b8590fd80cb8f2beac96084e37d SHA-1: 81024c1fd2c50f85f94068568382198b5af48865 SHA-256: a97b04398a2c5ca081f44828c59757f7500e178818b20eafd388aae3a8b997ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are designed as link farms or point to further PDF lures. Heuristics indicate it is a link farm on disposable hosting and that it uses a compromised WordPress upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=pronouns+worksheet+for+grade+8 PDF link annotation
    • http://naturestuff.nl/siteimages/file/78842931547.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210905215909.pdfIn PDF document text
    • https://edusfera.pl/upload/file/kidofawi.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/52138704991.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/mimizegasekexuxepek.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/73763278636.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/2950758801.pdfIn PDF document text
    • http://ximangsongthao.com/app/webroot/uploads/files/58422682660.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f88032d3a7---49207804358.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/nazopudejof.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/53167897620.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210904_155121.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/dajetopag.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b6f2042d9---44054323760.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/10318819559.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/bolazogilawixejonoparadu.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d4254828f---80623289886.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/87680757731.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/1859747265.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/46150739123.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/71982974769.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/nisusaboxinesepid.pdfIn PDF document text
    • http://isvpro.com/custom/files/34607450379.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613237010eb93---nutikigepajivesegowora.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_off0000efe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE8 18536 bytes
SHA-256: 53b5c078e5611ef780b0ff89df7087bb6685d79d63af8926d57c2eee7431b9fc
font_01_sfnt_off00012029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12029 10984 bytes
SHA-256: d3781a426af348bf4cc79f4be19288fee3504a14b6666d433bea455cbfc79845
font_02_sfnt_off00013991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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