Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f6e4a0ba3da40bf…

MALICIOUS

PDF

73.5 KB Created: 2021-06-29 08:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0b75b3244940c2392c135f32ad99bed6 SHA-1: 702b4d355cce7aed61e70f5e7450c945689386b9 SHA-256: 0f6e4a0ba3da40bf1ee5c2e0ddb19344fcc1e2e5d027c7929f43e288d97d67bd
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=different+types+of+mutual+funds+pdf PDF link annotation
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/522853e7e691fc1bff358eac21eb956a/jijurizuf.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/4c4c4b9111dfa31907d32d60de1a8e25/sipegozumepizonozadix.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebc5b271bd---vimomapogak.pdfIn PDF document text
    • https://mfdesign.hu/files/file/fupavupes.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/30663326582.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/riwuferep.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086d4218f683---94720154955.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/tubugo.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0316b6dcf56daa129ee98f0541ee4f8d/zutijupisuxugu.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/88425628156.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/givejozavoko.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9095543bc76fb55778f13c32918f9a7d/44309303085.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/239431119.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b256190f651---welidizotu.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/gudibikozamifigo.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/80c2cb3caa9ef38b8972aff6d207dd54/polefalexifikojebizexipa.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95fe158d89---85323664535.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021052016125762.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a56ab3924---3682855607.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/bd47c8f244bfccbd14d4d859132a9017/tilenopegeta.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/11d2dfcd0c312ec339091cfc2c5b7791/20281973944.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760e5fe9b6b---vidiwumepejusobepivorik.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/40720bc21f69ff9779993351c7e97699/93781452269.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/5ceblrp60cmic1vrp2un4ttuho/kedeb.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_off0000bfaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAF 15488 bytes
SHA-256: bd329d155426cdf71c4d2af4a584c5b404345332cf2a0d8aef90a3c402e7aac8
font_01_sfnt_off0000e727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE727 10876 bytes
SHA-256: 5ae885dc5ed0acacfe63ee5fb368770ac285223b506901a50a12a309da991a34
font_02_sfnt_off0001004b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1