Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad00d5d957f6baf…

MALICIOUS

PDF

94.0 KB Created: 2021-09-03 11:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3a1dd65ff209c42af7935b0877ff8ff6 SHA-1: d28ffc6d3427e3b469144cdf9b223bb16c972862 SHA-256: 4ad00d5d957f6bafe07adfc976016bf30cc789999392e46db9df7ced0b21fdd0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous URLs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to direct users to malicious content or phishing sites. The embedded JavaScript, while not fully analyzed due to potential obfuscation, is a common method for executing malicious actions within PDFs. The ClamAV detection further confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=sachet+filling+machine+pdf PDF link annotation
    • http://www.asslar.de/downloads/givosipu.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e21bcf45da3---mujimubuvatowelugiki.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/86cd13c7be5b3fd30184e6d65a96d04f/55482056277.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/17893918405.pdfIn PDF document text
    • https://wittnebel.dk/file/redabakobutakamaruwijazi.pdfIn PDF document text
    • http://thecuriosityshot.com/kemazosasoz.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/xonutibidupuborivir.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/05163d1072f51f21c5b040e4cae1ab4a/xevigumazuse.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b582565c4f7---viwazakupetowoporugarexiw.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/65437320492.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/99170748452.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a859bde4ff5---66376694277.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/80ff4e75400f30108771f4e3753d8bbd/97442957786.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3313003889---92248785241.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/8a35c9567671b90c717afd327ef0b807/77084914368.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/zovanixoxat.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/jebatatetazijokujip.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/f0077b375c85c43f382718926bfea62c/95067602796.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/41902529109.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/poduxagodalawugidizowovo.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/ed4b9f6d03b14beecc316d9efd1fdd40/kexus.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/27333478609.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/88444897027.pdfIn PDF document text
    • 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_off00010ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C7 18096 bytes
SHA-256: 571cd28872261c349a16b221458f40c1d9781abfae9d204f1ff43f7c60a6769b
font_02_sfnt_off00015238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15238 10756 bytes
SHA-256: 95bf40a585a7e3189dea8fd461c107caa6a229b9d4ff82b1e0f5c61954ac1823

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