Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f992674ccd2b473…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 12:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a942369a1c1f24aa8f2670b81de42c31 SHA-1: 3b910ead28dda0916d1264f668e6508a923f02f2 SHA-256: 7f992674ccd2b473c4242c76f0819cf21b1582e36e5514f0eaf2ad251079f5ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users to malicious content. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, providing no direct textual clues to the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1ff21a1cb---fipufefuwifesoladabejitan.pdf In PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/muwepereridipe.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/xuteribelexebufexogirufuj.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/57794a808aa40e131467e1d8bf77c04e/91936494366.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021051005501973499.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/suzinadikusitefowuxelu.pdfIn PDF document text
    • http://allasclub.com/campannas/file/14564819909.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160742f168e6d4---jipidemanojati.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/71353959552.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/juzapeva.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/40119089146.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/ruzalukulizasemim.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/dbdkievgpkhrtmpi2a3o8qh8hn/55884557097.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/96428349430.pdfIn PDF document text
    • https://tavio.ru/files/file/63815866821.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9834013435---siguvuxafawumamexepemudus.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/lemunevanon.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dimasu.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/pikozibapajinox.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/texopodakuguxemikeb.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/00bf5ad10ca48095c4cc016bfe1ea165/libufifigirob.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/watug.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/c80j4pr0ngmprrj04abvvf9342/19548706534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=unilever+nigeria+plc+annual+report+2018+pdfPDF 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_off0000d72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72E 11304 bytes
SHA-256: c63dc47a1d31807d23cbd35c8df7cde92bfa8b18d32660a8004c54b0ec6c9b45
font_01_sfnt_off0000f1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D6 17508 bytes
SHA-256: ecb646fba3b3301a9ef8e1e4b09fb389f77ff90466d564ab510e3ffe0c8c893f

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