Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7c7079f251ad1e…

MALICIOUS

PDF

77.3 KB Created: 2021-09-20 09:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d303280b7b8c371104338dc9de279903 SHA-1: 0f29e05731fd3bd5bb1074b9b889fb9dc75dab24 SHA-256: 0f7c7079f251ad1eab25d4c9efefac26b5e7d52cf2f7930c62f54515c44db32f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting. This suggests the document is designed to exploit vulnerabilities or trick users into visiting malicious sites, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crewmak.ru/uplcv?utm_term=convert+javascript+to+android+app PDF link annotation
    • http://shinies.ru/img/lib/file/9071454834.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/gotetifovonadurasazunu.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a832b9513d---pizafikedewepabenom.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614207f8d8a6d---begisiji.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/miparuko.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/jiforudurenovatawipap.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021091008123910.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/kejurufuxolur.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/13128872929.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/22337538790.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/nuneno.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/sutomatag.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/54842167089.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409b8ed88e3---kobixuxapozimosa.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/43247355339.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/28272605999.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/mudoruseligejelenuber.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/21773026765.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/bolobu.pdfIn PDF document text
    • https://diphong.com/uploads/71706102948.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8860c920918aaa06fbe544ad8cef2766/piwegoj.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_off0000ca74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA74 16884 bytes
SHA-256: f0150044726eece7060488cf638ac21a8c4e3b1c9fe19f6f30ffa98c24557935
font_01_sfnt_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECF 10688 bytes
SHA-256: b69504a12980d9d49e51b0026aee0ea3caf765cc53b7bc3c7cb7a19264fde84b

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