Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8da72f8f087b90…

MALICIOUS

PDF

93.9 KB Created: 2021-07-20 23:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 09813a450817b4386c5c6a594117fda5 SHA-1: d374269005612188df81f6296a816397d7afb899 SHA-256: cd8da72f8f087b90253e5c0a253fc7ed9c52d3903b8799e26ce764d057d52c8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous URLs suggest a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/4aeb6f214faafee6c3adeee449117c90/42775269201.pdf In PDF document text
    • https://armandofalconi.net/userfiles/file/68654232241.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4c48e1abf274e52d69f4215636251325/69541130274.pdfIn PDF document text
    • https://kawanmto.net/contents//files/gisodekatutuxaxowe.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd7ea926b2---tavonetumitowimepuje.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/jujanexejojetewar.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b97fbb53a---sowibodapibuf.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8ee668783---58888533185.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021062503239_621778328.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/527fd60461fec3437452929985cfb641/86774122446.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee668f5011e---16576404555.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/54125390919.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4b22a1be6---68003566555.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8mnae48m30jr4aro79nonkb0e1/sutetutakex.pdfIn PDF document text
    • http://abpaluso.com/upload/file/30910482635.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/ropitisifegiruzil.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/vizubutitefulaxexip.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7552669e0---dagipexax.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/crmkrog2ik5q1qsdi1agqtnkm8/pazut.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/rekifavolusabefafoxexa.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee11d2bf189---fesewesovurinuzapiwad.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a2909521---seputatabodibiguveref.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/vafofofesiji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=little+hoopsters+basketballPDF 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_off00010d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D91 10432 bytes
SHA-256: 1f5226b99283219aad3a46f2d251e4121743f251b299014eb998db2ef21482f9
font_01_sfnt_off00012523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12523 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D35 17300 bytes
SHA-256: 2f211cec6a5af683430bf8da076f982efe772d42e889819c3337d15592a45a36

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