Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc928f3c95651729…

MALICIOUS

PDF

73.9 KB Created: 2021-09-17 10:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 34047b79e6b63d8a484627f1948016e3 SHA-1: f346ce22178077815932e6da79709abfd7e4cd86 SHA-256: fc928f3c956517290329c574c1e01b4ec3164a4ec595bc9b17da8bf7f75af9e3
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some of which point to other PDF files hosted on compromised websites. The presence of a visual download button and the ML classifier's high confidence score indicate a malicious intent to deliver a payload. The ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 8

  • 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.
  • 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 http://vaynhe.com/upload/files/45132742691.pdf In PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbfb3f2ca0---54903049824.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/biwadotukofada.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/gokazarovatoga.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/senubineme.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/jiwopegikerolofuki.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/xuwupifun.pdfIn PDF document text
    • http://kbfrutos.sk/images/_file/jiwopixosutozorinan.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sumak.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/35246812831.pdfIn PDF document text
    • https://kawanmto.info/contents/files/vuzokali.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/tegozofotetet.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/jatopunobodonalazamijejak.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/6015891705.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/25825657945.pdfIn PDF document text
    • http://dentistturkey.com/image/files/tijesezagejol.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/konavopajuliwimugezupoji.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/04nlc1l7mugkc7cueo58hs3jrt/zezoxuvodixupod.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/46097073119.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/fe75bd007659deb5a6757b7c8ba25f12/10603460480.pdfIn PDF document text
    • http://bushurov.ru/images/files/bidabanolidodemino.pdfIn PDF document text
    • http://muszempilla.com/files/file/48176481561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+recover+unsaved+recording+in+androidPDF 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_off0000beb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB4 16772 bytes
SHA-256: dc04ee3e56ab2bf3cd1c5b8a402f2c07307eeed4eb7a4ad4f7262cc66c1865c5
font_01_sfnt_off0000e956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE956 10740 bytes
SHA-256: aaa08a43d9642bf283edbf47aef6be4b3e9ad8046bdd4bd7191a4bb2549f61b7
font_02_sfnt_off00010200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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