Malicious PDF — malware analysis report

Static analysis result for SHA-256 915acd2270eca7bb…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 19:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 51ed679ca649461dd02f5282f1f40506 SHA-1: d720b64c5da951c1aa87b1e6f563a0c3af28bfa0 SHA-256: 915acd2270eca7bb5f9f320027da4d38fdb595d1308b7ac5fd499dcb9fdc5435
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious. It contains numerous external URIs, including one pointing to a URL with a UTM term suggesting a lure for 'art of war apk mod unlimited money'. The presence of compromised CMS upload links and link farms on disposable hosting indicates a pattern of distributing malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pixomot.ru/uplcv?utm_term=art+of+war+apk+mod+unlimited+money PDF link annotation
    • http://jacsonsfurniture.com/userfiles/file/32283892360.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/niruwudikoroluvevujelosu.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16139640873683---84113569022.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/kikogapabezidap.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1613292c90efc2---86652991322.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/kipominemozigupo.pdfIn PDF document text
    • http://consade.com/userfiles/file/94467003198.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613396cbd3f15---34018464662.pdfIn PDF document text
    • http://dentherapia.hu/files/file/fokelagebano.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/17687020130.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/82439447823.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/071653453503.pdfIn PDF document text
    • http://we2meeting.com/ckfinder/userfiles/publics/files/pezaxogojexas.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/vitolexagivezovunogo.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/pazuduruviwatix.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/539575167.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/kewafavoladuvafiforupu.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/tipol.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/dovowozerunojanuveduwe.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/kulefufuvurewemejatimaf.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/67161529431.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/pelovotuduxadib.pdfIn PDF document text
    • http://groupkaishan.com/d/files/79809412145.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_off0000d88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88D 17900 bytes
SHA-256: 7ae1b0adf1ffed8783b9734e925b9ff5d4a2bf742834725f7078a4785b62aa41
font_01_sfnt_off000106d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D2 10864 bytes
SHA-256: 4299127379fe3d48304629fffc82afb376c8a3327479264622db9567a3a05214
font_02_sfnt_off00011ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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