Malicious PDF — malware analysis report

Static analysis result for SHA-256 1310e704842de8d6…

MALICIOUS

PDF

79.8 KB Created: 2021-09-21 15:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4ce21f86a3ea92f52a074bbe67ba2fbc SHA-1: e326a396ac37338f6c9b60e8106937ee4f690691 SHA-256: 1310e704842de8d6a8150b7c7b0c3f66e1d8621de4806cee396c12236684d663
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites. The ML classifier strongly indicated maliciousness, and the presence of numerous links suggests an attempt to distribute malicious content or phish users. No scripts were extracted, limiting the analysis of specific execution methods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://design-klasse.de/ckfinder/userfiles/files/wunonaketizokuw.pdf In PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/demorepej.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140539b02783---49652028830.pdfIn PDF document text
    • http://gurolmumcu.com/userfiles/file/fojigaguxasagasiwi.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/042c7213105f25f773dbace8965451b2/lezoxakobiwinubipokoso.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/25917479889.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/832a6b3e4f59df7da8a97128c5705d96/75408698220.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/50438280053.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/wolapisagovenakaj.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/fugunos.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/38886762460.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/20023981556.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/61349010593.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/vewaruropojozibasezo.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210913151745.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/bedewure.pdfIn PDF document text
    • http://cichanski.com/Upload/file/72368310410.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141e14ba06f3---75811457183.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/48077616268.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614152abe66df---14918857104.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d08ecd7779---futudazefezowinoj.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/40822c9f3beadb31f6f597b6cb0134b8/90779337332.pdfIn PDF document text
    • http://kccmaul.com/files/files/gifirezaliduv.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/pobanewalasazikepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=famoid+trial+servicePDF 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_off0000d3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC00 10468 bytes
SHA-256: 657c2b3cd28423d58c59f17765f833b62f2280b8dace6a8eb5d830e9a16a093d
font_02_sfnt_off000103cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CD 17760 bytes
SHA-256: ab011fae9922767a8fd9d355288413e17b1119310c860fd2003fe24d84d4b4d6

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