Malicious PDF — malware analysis report

Static analysis result for SHA-256 b993a2e3890c2a24…

MALICIOUS

PDF

216.8 KB Created: 2021-06-26 10:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1bbd249482ecde5c48d33ac68a7825b9 SHA-1: 9b4a5da73346ddcbfc219b5e48394b402b6ea0b4 SHA-256: b993a2e3890c2a24d000fcce1b5b75de51fe3f48b73fae31d6a75ffd571071c5
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including ClamAV detection and ML classification. It contains numerous links pointing to compromised WordPress upload directories and SEO redirectors, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure indicate an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://ketchas.ru/uplcv?utm_term=icao+doc+9137+part+8 PDF link annotation
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606da0e04779b---xenurab.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c7107c2ec---3966969445.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/883e8d330f3113c0453cec3a3b18233d/perowaliba.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/da8679cee6f182a5ddde4fbb231b2d5b/1752247900.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/3it3e8lk5l9ult1b04hk0983oa/dipomulagisuk.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/63502983550.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/84649752116.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/96807929183.pdfIn PDF document text
    • https://yellowstonewildlife.com/munuvudotufapezix.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/vazorarewuvosef.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/9njaj9ilgunju2gvo4hqeclkq6/jofonoralax.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/2jqphert3orh8gp5i8740j7vdd/nolodugupajaropigeded.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/e3c73d8de382de38dc93889895ecdbd2/10147105424.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb50e0f8fd---kamanukigozipidubobeg.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/58352531185.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607af9e4654e4---61214498659.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021053123584773499.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/m5cc4andpnhrim8ra79mqh1u02/51460711617.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/6067844008.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/93d37724737ed70c6dbaa05ce30e61fb/51514700284.pdfIn PDF document text
    • https://govox.co.uk/wp-content/plugins/super-forms/uploads/php/files/spm1i2e4598ij9l5uk66gkng14/16112443764.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_off0002f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F3A7 19228 bytes
SHA-256: 8d520d059da4b95ef653a2a799720ab8c880f0f8afbfbc65ad2c8504b02d92c7
font_01_sfnt_off00032541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32541 10564 bytes
SHA-256: f1f6c995a3828c97460320d26355f83251f6086a8628289218917d03a2d0918e
font_02_sfnt_off00033d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33D97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1