Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c216fc40bfb8108…

MALICIOUS

PDF

95.3 KB Created: 2021-07-08 09:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 42951049da725f6a06b6c95eecf1bfb8 SHA-1: 7f23eb9a9ab15bd13b5242418ad416c8c6ec85b8 SHA-256: 1c216fc40bfb810816c4d63fe01662a7862d3dd429c85dfeaaf8b393545b3da5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links are likely intended to lure users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0ee09e455---37787017523.pdf In PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b838d2d9a6d---sagoneres.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/74923152250.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/82a127e1b87bc417bcd2e0885d537077/87907306072.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/tamurenejixoregedib.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/bisuludivadutepisawub.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/duwibevoruz.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/69eb3f43c20cab4cb296cf343c677664/34562959666.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/49787236413.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbc73876d6---tokixubi.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b83893bea---28364523800.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a54c487f59c---75409709196.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/9a8af37e951018ecab33ef2cf87ef9b2/rivobufetivebezofilaluv.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/3f10aea9f8cabfa9d227f09cfe8b4631/potuderem.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082204301c3a---vifevub.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/9ad0a484304e61befb5a4c374b42500c/27414558122.pdfIn PDF document text
    • http://japan-railpass.info/images/blog//file/wegatikufu.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160728d9567eaf---fafaxedan.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/5ff540494214fac5b77ee24b8570645f/xibujogurudegerevafuxali.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/15205246351.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1717c32b06---tukipezotixeso.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bffe4ad7132---miduvitabutoseg.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/wagevofe.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/95494470443.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/dejigumufufudowix.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21ef52e396---liwemuxuwaduzef.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/5de8ff522312de068443dc9474ab7bac/nixebolafujewekileredaxeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=strictly+dominant+strategy+examplePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1E 11148 bytes
SHA-256: 4db08f886768e7ddf3ed2520a00b43fee8fbef1fc85833738247c14feb7cf94d
font_01_sfnt_off000128f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F1 17672 bytes
SHA-256: 22719abf45f664752da4e1f6c5d70c5dbff124b56b54bd0080a56ccbf18ab531
font_02_sfnt_off000157b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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