Malicious PDF — malware analysis report

Static analysis result for SHA-256 10725b5cb34c9332…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 02:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d34b8b8a07b110b963a86eae56aaa24f SHA-1: d45af769d16661f66440269050322af5b78f00b6 SHA-256: 10725b5cb34c9332b502fd69114f206f725172968647c5637f1bec2601196edf
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://drafthe.ru/uplcv?utm_term=order+by+and+group+by+together+in+sql
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607446318ea7c---80752999186.pdf
    • http://mya1fc.com/files/ckuploads/files/wikunizedoxiduwizefofet.pdf
    • http://maasmartcity.com/userfiles/file/19195683364.pdf
    • https://sportsslife.net/upload/ckfinder/files/gigubafakidu.pdf
    • http://studiocommercialedelpiano.it/userfiles/files/kajozesubenivezirefuv.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/31afc04bb1ae58ff392f729d923d4178/75460478500.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ed195c330---52779972618.pdf
    • https://feng-shuiworld.com/userfiles/file/50489797472.pdf
    • https://rpdev.org/ckfinder/userfiles/files/morebuwuviwuter.pdf
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/fdoutfq4ggib4b288e3oi41ilb/68465323921.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1dcb1733a---gexufepobopesiwowoxifo.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d4cd9b5f8---viduvemokobur.pdf
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/medozevijavot.pdf
    • http://coronado1977.com/clients/54390/File/bojanosa.pdf
    • https://dienlanhhonganh.com/images/pic/file/gunudaxutabebew.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df04742e042---nivuvexoxisefu.pdf
    • http://thedewakohchang.com/image/upload/File/1347282069.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/c644d4165e4f93403a7145d9e341b771/42924178189.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b5418145475c9308c8838f3f6d405847/5112181531.pdf
    • http://ggled-smot.com/ckupload/files/vekuduzonesapulozize.pdf
    • http://morebricks.com/ckfinder/userfiles/files/lixaxapi.pdf
    • http://bandenplaats.nl/cmsimages/file/vusoxazagulinesetiju.pdf
    • https://ptkas.com/kingkong/userfiles/files/zolodaliminewomi.pdf
    • https://cochleartudaskozpont.hu/files/dupudine.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfdd.bin
9e723efb38ca5c09cb46e90865c0fefd34e9a532cdb820e597cd3b2a351f006f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDD 11196 bytes
font_01_sfnt_off0000f949.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF949 16792 bytes
font_02_sfnt_off0001115b.bin
66c57bc77de8f40cf3f4e286b94aa9944b1a75f4f45fc39dddd9f2e8c5936250
pdf-font-stream PDF embedded font (sfnt) at offset 0x1115B 18412 bytes