Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aa2151ca11ccfb5…

MALICIOUS

PDF

85.9 KB Created: 2021-07-01 20:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f654c71bd1e5737691bf1a51034b206 SHA-1: 10400b0cc02ead6b462317c15723eb846aad389b SHA-256: 8aa2151ca11ccfb5d994a2c17750cfee66cf5b8b290041ac4cd8eb727fe5638a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous external URIs and link farm heuristics, indicating a likely attempt to redirect users to malicious websites. The document body is heavily obfuscated and unreadable, suggesting it may contain embedded exploits or malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chcial.ru/uplcv?utm_term=novena+to+poor+souls+in+purgatory
    • http://jp-photo.cz/soubory/files/kupatogefifefuwopoxuxi.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/e851291bfa27fafd545afa36aa2b024e/podowuk.pdf
    • https://getracemirates.com/userfiles/files/fabogemafe.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e5c17bd88---dinadixixiguxoruvugiga.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889d245359f---21337347630.pdf
    • http://alituncer.com/userfiles/file/68782971053.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097870feb085---nexijukese.pdf
    • http://ecandrychow.pl/Image/files/juwusiwe.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609f97a4edfbf---23776963959.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/2d58b1dc30853c1602302b5214741cbb/xaxumarifoziwazaje.pdf
    • https://avonsteel.com/UserFiles/file/56698379362.pdf
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/kepirowarozupajedavamupep.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608c01a0206af---12055071396.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b58ea528f66---28988655016.pdf
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/2544251b72b6d32e9fc83eee61af9ff1/niruzuxemo.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/cb111c32f4a5092cc8e6814ee41eb49e/latuwid.pdf
    • http://nhhs78.org/clients/63854/File/70436574763.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/bf7ce80e5ee39aeaa8fc5f19cbb53529/45772856076.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/0305d684e17d6d9f1f435ea5b3bf125b/89364655335.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/k9duqipodkh4ut1av453javkda/gujojoji.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c03571ced34---94964254262.pdf
    • http://stlnsk.ru/uploads/file/kiriwovebemeja.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/3b6233251aa9c4bee08c162b9f3c6018/98730252646.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dffb57da19---12512657641.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160808fa664cff---19986975483.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_off0000ed4c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 16792 bytes
font_01_sfnt_off0001055e.bin
eff40537df8a884f16ccab11119a679164e37595deb5c4e659f67e6fb19bf35b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1055E 16444 bytes
font_02_sfnt_off00012fcd.bin
f4f53809497d4a50fc4d71959bea552ad86c4bb381115b62a96b2cda6fba5d2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCD 10684 bytes

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