Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c46671c2169b16a…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 00:08:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d7d1d8f8ab09f4b769174e0d991d357d SHA-1: 9b372f31e2bd725b6dff5ce2e3bf640ac9a8c9b8 SHA-256: 3c46671c2169b16a8ab6c26d0fcbeceb5e41d96e78e6ea2a6a4e94fff85f4661
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs pointing to compromised websites, many of which are hosted on disposable domains or use link farms for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=databack+apk+download PDF link annotation
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133a913d8bb3---23245488142.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/lakixer.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/rurifefaxelagozubinivi.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/51153315499.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/90947886622.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/58217681230.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/momif.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/raxurawosalogaxumawawof.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210918_61F6F81E13824166.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109170118269197.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/0b78357b4fc52af73361d699c5618e14/jirazawumofotelomap.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613fedecced89---79755197045.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613336bfb7e78---kaleku.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/mivexidokonuponoz.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/wireripenevofuxaxuvogagu.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/60144870204.pdfIn PDF document text
    • http://newcityhk.com/userfiles/xatudodovotalebiduvogabi.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/nonekutujazanejirotejoreg.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/8179405114.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/80566004666.pdfIn PDF document text
    • https://profm.hu/files/file/begejefasomifirawobemi.pdfIn PDF document text
    • https://ags-car.com/upload/files/zubaletivuxorupimebugijo.pdfIn PDF document text
    • http://hotechike.com/files/files/nexokelurepokawujatumuvi.pdfIn PDF document text
    • 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_off0000d986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 18156 bytes
SHA-256: 71e4231925a749b6ea6f141e77be7645c43c5419b61c86df34ee1797b71da080
font_02_sfnt_off000120db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DB 10336 bytes
SHA-256: f87fca36f5fcc3e02e1525f3aa76820e6f4c83bf34990bdd9d50764e763a4404

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