Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab8b06b2366c467…

MALICIOUS

PDF

79.7 KB Created: 2021-07-14 06:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a570a61a9f5a73fe099ff7d303c8dc73 SHA-1: 91f50523efee9eda93003348e5bef3108e448914 SHA-256: 6ab8b06b2366c467793b88baecfaedbb1ea816ab6e9d9036d17102adc7e086f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://asea-admin.com/_userfiles/file/20210504235558.pdf In PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/jipezaponoje.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/96504957384.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/03b97c0a7c8c0bd92e8a6c67ee972a58/lurubesirekinos.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/06/20/95324611472.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b95d02e7d---22425828250.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6768505a1---95891123092.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/18132512723.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/83614046382.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/ladezojepezun.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/98rn9126ntfeg5v7ol7qruv6sl/9392785897.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/ruboxifowujaxovutamug.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160784a916024d---wuwepimoxujez.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/nomoregematosibojejaz.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/wefagipadut.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/gamofonul.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/m7jfg1thapmlnq6lafnr1n76s5/lutaluxukilaxawe.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/moxotagakasodi.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/fabuveg.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/zaxalilubetobutuxejoma.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073b5cc46161---lapome.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16085a72b33d89---30081897188.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pekos.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/69qtiqa42rgt4bujskdt06n6mi/64068883769.pdfIn PDF document text
    • http://ipublicity.cz/data/file/391385408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pok%C3%A9mon+let%27s+go+eevee+apk+download+for+android+freePDF link annotation
    • 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_off0000d065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD065 11276 bytes
SHA-256: e0ac233394b9224bdb02f17f394dcf341a576a186d2d23a7df710763cf49b9db
font_01_sfnt_off0000ea77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 16852 bytes
SHA-256: 37eb53ce9983b7b5fbba58e62285026578786df033e4b54ea7d054fc5c67ce51
font_02_sfnt_off00011636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1