Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea9cb58fd9fa7c2…

MALICIOUS

PDF

82.3 KB Created: 2021-08-31 02:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f5ac3313a034a37296255dbdabf4b09 SHA-1: 290a7d6e38ba66945e0dfb4c4859b89632b0a840 SHA-256: 3ea9cb58fd9fa7c2af6f7d35e374f2501197f02a1b949a4b1906eb91d56c0379
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://krisoc.ru/uplcv?utm_term=the+road+book+synopsis
    • http://hotelbelleepoque.bg/userfiles/file/suzipoj.pdf
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/fawube.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/58105b43b457e79036b2e591f0bd0381/48015930388.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160867e83a7d37---rarisanomujit.pdf
    • http://lnianemarzenie.pl/userfiles/file/tosubofufo.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cfb0eaa01---4784915379.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/tapalizaxuguw.pdf
    • http://stefani.cz/fck/file/29269402641.pdf
    • http://banphimchuot.com/userfiles/file/37913901783.pdf
    • http://prestinoequitacion.com/imagenes/upload/files/tatopotanis.pdf
    • https://ysh.my/userfiles/file/63854466982.pdf
    • https://invest.pl/userfiles/file/93301475620.pdf
    • https://mbamantra.com/ci/userfiles/files/88939523722.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/e4d6e791efd54afac5a4ac0e052a3d49/70990997215.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/52n61co4ub80uhp6mv6a6oj7k6/81605681308.pdf
    • http://reicar.dk/userfiles/file/funebojewuxowi.pdf
    • http://asea-admin.com/_userfiles/file/20210713212703.pdf
    • https://kibledergisi.net/resimler/files/gudiwode.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/64027726471.pdf
    • http://gps-tw.com/CKEdit/upload/files/robamifuwikoxugo.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160716d8965be3---90478423257.pdf
    • https://holcom-wd.com/webroot/img/files/67049831039.pdf
    • http://yonseri.org/userfiles/files/33272403919.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_off0000dd34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD34 16792 bytes
font_01_sfnt_off0000f54b.bin
8766a83df783b9175b6ead1624c32825a2d136e9a4488b441e1027f27cd097d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 10656 bytes
font_02_sfnt_off00010d64.bin
6808cf2921e1f4fce4384377f9f4d45f10df51c53cf171e11d95777bac5eeefe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 17704 bytes

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