Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e48150bd6612c50…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 19:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ec511b390044404695fcd6f244beb828 SHA-1: 1a3790e0dd9962e33d3376403f3f625d5ab51f08 SHA-256: 6e48150bd6612c506fe65531c4ed95dad1cb9200cf8461a72c2f584cdcc07109
176 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. The heuristics indicate the document functions as a link farm, directing users to numerous external URLs, many hosted on potentially compromised or disposable domains. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly suggests an intent to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://gayaarchi.com/userfiles/file/20210531215352.pdf In PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/08fde3ffb308e1215e71ae9b0768d635/62190160417.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b872c8f3c---42723014938.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/85629207331.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/40186784293.pdfPDF link annotation
    • http://plafondchauffant.fr//img/user/file/revaneduwanironomutagubex.pdfIn PDF document text
    • http://edsmithestate.com/clients/8/8f/8fcea3baa00381bb68ca4dcda22eb4c7/File/55820623003.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/44mvk9soq4gbfufnlae19t0uvl/24875112395.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cd4c35e1c---fanibegikuradojakodo.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/kezob.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4258487bd---xesexoxoxupino.pdfIn PDF document text
    • http://www.bash.cl/media/file/76082651045.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/porawemonugojomapefus.pdfIn PDF document text
    • http://klinok-saintp.ru/files/83525459524.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/86137129676.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a18ea30b2478b17b26b57a75ee03cb2b/visujajozatagisa.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/36cb1dfb70790cbbb20e3dd775eaba25/2615456990.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/tg7nhnqt5pcplvhss9ct08noea/ridujinuduvofubuvakidix.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/kanatorovidexe.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb3cd13c7---30738138581.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/11858293110.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/afa89c1edd0934ddb0ae243a4cd35a42/dowubadanokepizemagakos.pdfIn PDF document text
    • https://olterus.net/contents/files/77408273518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=copying+pdf+into+word+documentPDF 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_off0000d51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51D 10920 bytes
SHA-256: 4d4cae3f69c7c4b36ac78be3762d4ebc79c301f38ea243fba842be5b960e053c
font_01_sfnt_off0000ee4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 18188 bytes
SHA-256: dfbc92c09ef90e48a63c0da3c0eeded77e3d826df5f26a7aad04659f942b955a
font_02_sfnt_off00011d4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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