Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3ab16e30d90b37c…

MALICIOUS

PDF

75.2 KB Created: 2021-09-16 10:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b9217204fdc848153c012803c091335 SHA-1: 6dfdb5f1def42db456d1f976e8c03a6bc4b91840 SHA-256: c3ab16e30d90b37c212c9e5d27fe31ac8e7ed3cf26faf676f02d2a8e4745bf09
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable domains, a common tactic for phishing or distributing further malware. Heuristics indicate the PDF is designed as a link farm on disposable hosting and points to compromised CMS upload storage. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://leylatoprak.com/userfiles/file/vijivenikanapedogob.pdf In PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/a8e88715ec176a47206757f2d683ff1b/getaramisapofizekomufe.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/puwutuwo.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/fedibuwuwozamusu.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/31934570143.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/kukebabi.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/e93cd12eadc32bc655432bce988a99ae/38859231104.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/zinonedonubobubomevupom.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/belotosewonodali.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/kotodulolozusilu.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/jusilekerelo.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/77097433555.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/77659924337.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/68771643482.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/42760167792.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/20213857993.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/19213171194.pdfIn PDF document text
    • http://esteel.my/userfiles/file/72095176642.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/sagenifapelikewuje.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ab078a998---lobidijepoladogedipat.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/zusedi.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142dd05ba594---venikopirozakegojovipeji.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/27876830275.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/87123698336.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161335e45ee4c3---lenubatub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+last+of+the+mohicans+summary+pdfPDF 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_off0000c463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC463 11064 bytes
SHA-256: dedfffe5f0ced23b248a06aaa32b302689daeec96311d6869e3e28aad3f11a2d
font_01_sfnt_off0000de04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF616 15960 bytes
SHA-256: 7e97c046d30c241709bf7a947d4a7bea506aa5e5a8932820b4cdd9f0f0f20bac