Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff59c7f2d058701…

MALICIOUS

PDF

84.3 KB Created: 2021-09-16 20:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0ae1932caa7b2b1ec91a28fb03e8f1b7 SHA-1: 3229a88278ec0bb840ddc735fa21713df57c9d25 SHA-256: dff59c7f2d05870158b44d01e19a348c246682d9ea37a9b3a87d87e6a2d591c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm for phishing or malware distribution. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the file, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://hanilkwanla.com/uploads/files/94357611269.pdf In PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613314557a6e4---guwogawidepa.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/vutejesu.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109120820138014.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb7c6cb655---38585513698.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d351dd7576---15844092631.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/jagotarugogedanelijozoma.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/19797140592.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/80175119035.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/padivizu.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/10725146240.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/17646803606.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161417e99e6fb2---55492731859.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210909093018986850.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/c98f26c3bebaa043caa523afe9961e13/mufatekigimulawewa.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/73811586337.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/33178605402.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/zepajubixonesobunatonakak.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/92442607450.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/davilaxikunelefak.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/4773582335.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c8d2131d6daff1a9a77b0747334b3ba7/resedamilugunedago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=fortnite+hack+download+mobilePDF 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_off0000e2da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DA 10764 bytes
SHA-256: 1d033c21b0049e163b930330933ccd9b7ca8b3a180f09e75b3bf5896b585da5e
font_01_sfnt_off0000fb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 18544 bytes
SHA-256: 6728c88eb4417ac62a50f6befeb500dafe810b265d7029d115721b528d9c06c7
font_02_sfnt_off00012b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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