Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a6fb1cb7fd147c…

MALICIOUS

PDF

78.2 KB Created: 2021-07-15 18:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0bf60696c14b95334f13d280a4dafd02 SHA-1: 486e4a05391048affac114a2891edba60f04d0e5 SHA-256: 81a6fb1cb7fd147c7968f1355dad167087f5f82a4fd5525b138c16bd3f9a86f3
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/eba8524f510cb79bc5e42c4825fbc12b/rupowabuk.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ca390b57f---riran.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0152bbe2f---59444521210.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1vfs4sr9k929nao2eg4t6u75ou/wozezukukixalum.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160792e14073df---sepejal.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f909e304c6---21553511300.pdf
    • https://hometeamcorp.com/images/usr/jonolanodo.pdf
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/femowixuxekikujigirupu.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae94d488558---kebitewuvimi.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608be7973c97a---subalidami.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/16jns7u799ro5ctlsrchchhhtf/fotoruxe.pdf
    • http://autohondl.cz/userfiles/file/15642528979.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/kt9lj148tgko2d87a802gv31oj/99388423362.pdf
    • https://vildmarksjagt.dk/userfiles/file/jekupezotusutivob.pdf
    • https://uniontend.com/userfiles/files/zitozojubug.pdf
    • http://www.nachtruhe.info/up/files/vusolebuvesobuvi.pdf
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/70486407052.pdf
    • http://chunmianxian.com/upfolder/e/files/20210617122804.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a4dadfde4fa67c0022e0e90d61de2c2f/89446138465.pdf
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/48883d0d47069e81d4d36244005a8904/jitifega.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af96f7d42aa---40991356555.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9b108f41cbd9e7c38d21df6659704e2a/19779764992.pdf
    • https://planet-for-events.de/userfiles/file/lolomowizutowosizesaze.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=computer+science+aptitude+test+questions+and+answers+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_off0000cc34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC34 16792 bytes
font_01_sfnt_off0000e44b.bin
909a6b371af3019b1d2a457e9f5bdf452c1284d6c65be81c5bed8a3a5f878956
pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 11096 bytes
font_02_sfnt_off0000fe0a.bin
29cd53a0ee87158e9f46bd2468a1f09902f405423ac5e00c87b16d8f09687681
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0A 17144 bytes