Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c4f4348576b216…

MALICIOUS

PDF

96.7 KB Created: 2021-09-16 08:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3983b4fe02eca166011e921979768727 SHA-1: f4cc8cac8f8a11beb8d499c4ce49a61c54a627cd SHA-256: c0c4f4348576b216526deeabfa620a22f8ce6302665bc749dcfae189381106ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to distribute or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://acevina.com/webroot/img/files/15152738962.pdf In PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/sofipisarifimaxusizevaman.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/xesezabimomozizutanule.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/forevetovetozivom.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f10eb717c0---48426193888.pdfIn PDF document text
    • http://theipbuzz.com/images/file/15296257474.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/juzejegimugu.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/94767855500.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/fazimavuvu.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/8b6d31bcf08f9247a6dd6da1f189344f/68165831130.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1e611f01e---33627014029.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/zulolofekomijarope.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/19009436724.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/dexejufojo.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/riduv.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/28619894275.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/6c3cdcd702c6abdde8e3ba84a0c0b9cc/wepuxilununudizud.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/fivum.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/bf2c5f13053de14162c9b5daa9ef356c/65125422459.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/fowuduwosisotajonim.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/89251589633.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/59700099545.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/42340432275.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/moguwefogasigawoxekog.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/43226586589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=romans+malayalam+movie+download+utorrentPDF 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_off00010ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBB 19864 bytes
SHA-256: 802e5254607656b1b3fd7d6035c639f77b4f27c54813eb18f3acb6a1865b44f9
font_01_sfnt_off000143b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143B3 10820 bytes
SHA-256: c0e426741f4009211e2ae8a3f07caae14e2d92b1e1fab3c9141e935cdb7fcc1f
font_02_sfnt_off00015cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1