Malicious PDF — malware analysis report

Static analysis result for SHA-256 607d92ae7cd335c7…

MALICIOUS

PDF

87.5 KB Created: 2021-06-27 17:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3614f2cf27cc0478ab24e5aec7a45209 SHA-1: 4d1d3705a6be096d4a864f8fb060a25d3f69ba3d SHA-256: 607d92ae7cd335c7d6d8b84d49da1fd6ab30247461ce3c645e0a6de2f29492a3
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

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 http://maskaevlawyer.ru/userfiles/file/batitu.pdf
    • https://haysalon.com/public_html/userfiles/file/bakumexexefixuvu.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/v8r0mt9pj0t6otdq9buen2jsl4/dowujuso.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abe3032e176---dupudafinefexekanifo.pdf
    • http://tencanpowder.com/d/files/53272201498.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16085be189e9f4---sigewazawezedobem.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607359bd90041---kezazifofilotuvupovexak.pdf
    • https://abe-rdc.com/userfiles/file/nafekokoguxegilinog.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/68c6b7115408b1ebd7c548b285ab1ff4/rozuvajumusinitevud.pdf
    • https://alutat.com/data/file/fumetezugo.pdf
    • http://montri-inspection.com/naichabub.co.th/images/upload/userfiles/files/belibibalidofejokapuwiwos.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf75d571a4---66867790944.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609830928b3e9---10660421298.pdf
    • http://capri.lt/userfiles/files/depovif.pdf
    • https://underworldgear.com/upload/users/files/kugurepad.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745f18e8d65---mupavenodinum.pdf
    • https://lawina-radom.pl/files/file/95488354622.pdf
    • http://gabortech.comadmin/file/29171120351.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a875f35a2---zobavajosirot.pdf
    • https://ivanamihic.com//files/sojojaboxefodegowoba.pdf
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/tonebifonoximexapeviraviv.pdf
    • https://medtek.vn/storage/file/49980929673.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58a143572a---pivumedoreda.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fd6d913b9---bufuveta.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=jessica+isabel+rowling+arantes
    • 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_off0000f18e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF18E 16792 bytes
font_01_sfnt_off000109a0.bin
9de89f43b9cc5dfe5238eda2c05c75ddf41cf848ad83528dcaab87dcb41ddd90
pdf-font-stream PDF embedded font (sfnt) at offset 0x109A0 17064 bytes
font_02_sfnt_off00013681.bin
f04b91768d8e0e36407ccd393fda8cb8be94db0219da3975f879f73cf8412cac
pdf-font-stream PDF embedded font (sfnt) at offset 0x13681 10624 bytes