Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f02b92cbccde4f2…

MALICIOUS

PDF

78.6 KB Created: 2021-09-08 04:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d35089a46cf731af9800667b5e62fccc SHA-1: 9255ddbdc25420a47ac7fc6e1085149c5b7f8048 SHA-256: 1f02b92cbccde4f223c1ed74ffd188268529760db9c9a12674acb54c072f8063
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16106042c6640c---vopakeze.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/18b89d303badf3dc123cab8ff78c7c5f/lojilogabakot.pdf
    • http://younewstoday.com/task/userimages/file/48845779898.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbed6f37cc---88071369249.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/fbcf52cf6b5a5b1afaa33b1e40938b2d/14347614868.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/af9603f7341458c8e05112fceb31483b/nosipukaribe.pdf
    • http://poiskvod.ru/images/file/fifobagarenu.pdf
    • http://nitexprofi.cz/userfiles/file/81174478261.pdf
    • http://hqshop24.com/userfiles/file/jugizebomirujagakotufid.pdf
    • http://autoset66.ru/admin/ckfinder/userfiles/files/75749310207.pdf
    • http://hamzalegalservices.com/userfiles/file/rokikukowonax.pdf
    • https://thegioidongphuc.net/ckfinder/userfiles/files/14443898775.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1155e65e3---15576525754.pdf
    • http://www.elstar.ru/uploads/files/98365215262.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-10/20210510043308452530.pdf
    • https://baatco.com/ckfinder/userfiles/files/vimuvowelajazeninegeseve.pdf
    • https://llibreriaha.com/img/events/file/boretojusaru.pdf
    • https://qnzar.com/files/ponawabize.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e4c1b6e7b---70418418150.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/33991954115901d75db2db661ea7f111/saloxebele.pdf
    • http://beta-rc.com/upload/files/mopigamawotozogaxamibire.pdf
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/xegotuzub.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=converter+pdf+to+jpg+download+free+software
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd5d.bin
d1593e849219a61c67fbdfa93faaeddb675b4869e13a26e1b0aa3369f8a4d4b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5D 17612 bytes
font_01_sfnt_off0000fb73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB73 16792 bytes
font_02_sfnt_off0001138a.bin
fb8b77517401d900d1b4202a0ca9f7bf2511564e5eea6ec8295f9005fb4c6c56
pdf-font-stream PDF embedded font (sfnt) at offset 0x1138A 10896 bytes