Malicious PDF — malware analysis report

Static analysis result for SHA-256 c622a273ce5a8dbc…

MALICIOUS

PDF

87.3 KB Created: 2021-06-27 04:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 780f3694d6a0d11b1ba9833c6269aed1 SHA-1: 5e3e0177bfaa7954966ca7852b9a683fca1ea7cd SHA-256: c622a273ce5a8dbcdb8e1763be82b07bf0b77bbb3b25b1e7818648284cd28364
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. This structure strongly suggests a link farm designed to redirect users to malicious sites, likely for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://newtech-utm.pl/userfiles/file/luvesumifabebajesokojar.pdf
    • https://abeess.com/userfiles/file/22573016350.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d2a538730---setebubojitu.pdf
    • https://privatecambodiatour.com/userfiles/file/20910202096.pdf
    • http://rolmech-strzelno.pl/Upload/file/48196825554.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/fsq08kqgdajfiagduh6qn4hlu0/velizaxipituv.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/zuvokutujufegazilofud.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/vowolazavewumuxidefevan.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/rfmgpv505pdc61i71udd9ilsl1/jowonobupujadufid.pdf
    • http://kleinschaden.expert/userfiles/file/23211429356.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160786a1ce0918---nodazemurogox.pdf
    • https://eyetracking.pl/userfiles/file/fuduninajexudukun.pdf
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/nonaxomi.pdf
    • http://versobrokers.eu/userfiles/files/bumemojo.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e6aa59b10---zogos.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c86c1f683b4---bosabopomasev.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c292db723---fefegabalewowenodara.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/hc2i02j5lrhvs5squb549tps94/11239615974.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6d765037ad6c9f59a5ba9b0156c76b79/91450841252.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16077b2ce8046a---64693646488.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160cf227e1f7a6---74412999258.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d100cba11d19c5bb68f6050009399fd9/nozoludorug.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cost+of+living+stipend
    • 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_off0000f221.bin
57def106977e3b741068cb5b23535cc763bb30491a97c7e337ffab1c93f6e5e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 10508 bytes
font_01_sfnt_off000109f5.bin
dc0f488932b70b660b65bf4be70220c9d0919e4f4fb04f01e5525da98fbaa154
pdf-font-stream PDF embedded font (sfnt) at offset 0x109F5 17524 bytes
font_02_sfnt_off00013801.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13801 16792 bytes