Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a7b3327ac1f338…

MALICIOUS

PDF

75.5 KB Created: 2021-09-08 22:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 864b4629288a3ed110721b47523f45cc SHA-1: ea6aeabeaa4232f5677e7fcb744797867d0bb6b6 SHA-256: a5a7b3327ac1f338e1142569ff9dba435fc0811e9c7aee6e1746e75c7ff76c54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various websites, many of which appear to be part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. No scripts were extracted, but the structure and URL patterns suggest a deceptive lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=harry+potter+and+the+sorcerer%27s+stone+putlocker PDF link annotation
    • http://architettogherardi.eu/userfiles/files/gozifaribokulu.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/losamobitata.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/30499329898.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/26929252221.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/4179885793.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/guluropeponika.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/gowotadef.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/80887420210.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/38682841057.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/botofagawazowubovavamoxaj.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/23477921692.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133ef290acd2---gituragopu.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/60243170222.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/lunesusozofiwajuperux.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377cfeed8d1---57635893588.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/19153054756.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/wamiwedasafowizimezor.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/86332727774.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/77694462982.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/67159510758.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613340902a7f7---gamebotuvidadogud.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383745e97a4---kizudoselanex.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/gasadezegum.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_off0000c2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD3 10848 bytes
SHA-256: 55ce4ded70a0c2f49328e24f90acf9ce0193400eb01d3cfde1a26360d92a7fd0
font_02_sfnt_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 17240 bytes
SHA-256: 790c5e9fad5bdbc481ef4b5dc54dfdd115f377a658228b5572fc646da53f6900