Malicious PDF — malware analysis report

Static analysis result for SHA-256 70176b2b913fe810…

MALICIOUS

PDF

85.9 KB Created: 2021-09-09 04:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8406731cf38dd4e4a3c64c02fd693d26 SHA-1: 4d193efbdad27fe7f149617604846d8dc945a297 SHA-256: 70176b2b913fe810f0f5433ad4f25e1786bb89d52044d02fbf854b6c6c213614
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are identified as link farms on disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these external links. No scripts were extracted, but the structure and URL analysis are sufficient to infer a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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=deer+hunting+game+for+android PDF link annotation
    • http://china-zub.ru/userfiles/file/sebejufujusuxejavufeb.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135610119811.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/gipewibipix.pdfIn PDF document text
    • https://kham.vn/userfiles/file/dibanowexafopipisi.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109022223105727.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/66492282232.pdfIn PDF document text
    • http://net-work.cz/data/file/lemefekajapukozadotabobu.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/viwifa.pdfIn PDF document text
    • http://isitekmuhendislik.com/userfiles/file/17614002535.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/6060048971.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/fikimupekadazeket.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630483733.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613625e314f2b---5489607927.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/venukubaledafajo.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/sikaru.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/nepefevalakaxul.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/49112781315.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/ruferidalurimajuxi.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/larak.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/zujebodululibenida.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16130d27049196---rukodobowemanif.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/43925439982.pdfIn PDF document text
    • http://zuche0551.com/upload/file/65107222237.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_off0000eb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB91 17968 bytes
SHA-256: 441ddb6003de653c888cc63f47db66017dbfb530a402beac2d41ac6254b6ce9d
font_01_sfnt_off000119ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FF 10688 bytes
SHA-256: f8fce52cd8becac23caeb02260735c53c94bd3a58863e14ce9387379955742a2
font_02_sfnt_off00013216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13216 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1