Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8feb601bf03b53…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 19:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0e0ed47797bbaca218d1477c03022027 SHA-1: c0aa6836339388b531c33f60c349ba6c639b9b6e SHA-256: 3f8feb601bf03b53e81bdc3d54518413f0523b8164d38fc11e8707692c935b6a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised CMS uploads, suggesting a phishing or malware distribution campaign. The presence of a 'download button' heuristic further supports the lure aspect. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=galaxy+note+9+connect+to+pc PDF link annotation
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/tiribelebi.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/51686458589.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/15074054431.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b68dcfc2d---bolodekizozefeku.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/sigevagudi.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/25170781290.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/foxikedal.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/wixan.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/xavariname.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/nulokawefinopagunajupiv.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fab6b02021---82834137929.pdfIn PDF document text
    • http://boldogelet.hu/media/gudizifutinu.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/d606726691de5f8d79b4ca72ca09d8b0/53294376006.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/59454ab867d5a12360e887c26fcb28a0/xedubabaraxonop.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/mikegisu.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/kff1ulbjgdclm5m52984mfgmj5/fazilovepidadilanobawusib.pdfIn PDF document text
    • http://rilta.net/userfiles/files/11312537706.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/71470530109.pdfIn PDF document text
    • http://esistore.com/userfiles/file/fivolovude.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/repisopepuxateb.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/fixisuwitusutivibe.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/pimadusuxitenurisija.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/vitofuvaruzizak.pdfIn PDF document text
    • http://adriennemason.com/assets/files/jedexerip.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_off0000d64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 10432 bytes
SHA-256: cf59e780ea93fe2283e8ae2f1d82e32f2c0ad88d20f74da3cab0243243964847
font_02_sfnt_off00010649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 17444 bytes
SHA-256: 0397ca6caa0f80ac463887507ca2b3c24594f4d803e274f043a0cfe2b9a82428

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