Malicious PDF — malware analysis report

Static analysis result for SHA-256 795827220723bec3…

MALICIOUS

PDF

85.7 KB Created: 2021-07-24 07:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80752fd98756e3cf56e14a64d3bd66ef SHA-1: f9835f155c39afd020fcc262b39b1f9218175e79 SHA-256: 795827220723bec3a0dadd718b2465a003e8a9f777e1bf10d05d52e94d8c01c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://centralgiving.com/media/userfiles/file/guperukafisisi.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/69c023f3d6b56798d9ac7a239cd4add9/pobizimukabo.pdf
    • http://dioceseofniranam.org/userfiles/file/31514186411.pdf
    • http://xtra360.net/campannas/file/tefabujisisikawojoferi.pdf
    • https://hondamienbac.vn/userfiles/file/76649517664.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a5da880f3---jibidu.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820f483aad5---78373944163.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d07f59bb67---59324411121.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d4c6dc08b---95025584587.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d09b9ba5d---35944423999.pdf
    • http://nuovojob.com/userfiles/files/69744949354.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87b641d957---desaguvekiwexonepuvana.pdf
    • http://angeladaniel.eu/uploads/files/mowixerakajokuw.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/aabc62142caee3ec16ddfd1b8356fcec/molebugosojurojij.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/43616eb505014f8eb3c69305a517290e/fapewixikidujujubumebu.pdf
    • http://norilskgu.ru/userfiles/file/7834355003.pdf
    • https://eminencesolutions.in/resources/userfiles/file/26378582725.pdf
    • https://tasleemdubai.com/userfiles/files/xukivo.pdf
    • http://b-solutions.net/userfiles/file/waxak.pdf
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/48901604139.pdf
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/fovunofeje.pdf
    • https://unique-u.biz/images/uploads/file/14896693738.pdf
    • https://flyags.com/editorResources/file///47948413726.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ca1302ad5---71197651272.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6437b83822e6e735676230794d2fd22a/kusuborilivusafepipovix.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9b4a2000b9b1f7f4f1ddd47ee9ed5a33/bumativotik.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=explanation+of+delegatus+non+potest+delegare
    • 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_off0000eba7.bin
89c13990b359f5f52b3b17b9f209147a1afcd5ffb7b96d5f0a17a8ce10a58de0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA7 16812 bytes
font_01_sfnt_off00011746.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11746 16792 bytes
font_02_sfnt_off00012f5d.bin
d053cf9012007c08822e89050b338d21ec4d4dd2ddec6cecd439ae43a8ecddba
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5D 10860 bytes