Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a2421320f0dd174…

MALICIOUS

PDF

80.2 KB Created: 2021-10-07 22:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3ce202fa363314c859088d5f3038b525 SHA-1: 85848d9f18e090bce16afb3c9843e2a07a955a16 SHA-256: 7a2421320f0dd1746a7c21b4a5d889e56c2bdf21e18d9ba9efee89dd087fee9f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing attempt. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS platforms or disposable hosting. The document body is heavily obfuscated, but the heuristics suggest a lure to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://hyunsin.net/userfiles/file/84217711628.pdf In PDF document text
    • https://kurishupally.org/userfiles/file/supoxizixitudukanufikew.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/88692875994.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/72296614659.pdfIn PDF document text
    • http://odumakus.com/uploads/files/lixozameda.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/47220195728.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/86704533255.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/20905440956.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/fugulumoliketanoribum.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/62396806360.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/bofigomuwewerinisu.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/69918997708.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/34254261346.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/magajapodidadana.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/dijifefekarizu.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/ruxagegemesujixodemakabor.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/jekegakenewu.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf849e7f71---19436330494.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3d4ad5f4f---povonatutu.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/65744468790.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/dlrdt2bh5kgr14s1o27msoo3r5/62473690816.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210913_F433E5C21108EBF0.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/90099166053.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f56025c488---2394367659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=eye+pain+without+rednessPDF 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_off0000d512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD512 10724 bytes
SHA-256: 6559e3e0bac9c3a3fceb777751f209d3da7e6c710568c79a2d0173fa201826f3
font_01_sfnt_off0000edba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CC 18112 bytes
SHA-256: fa5168581a20bb2e4f2a83d9d571f5e5b1dcd8d56bac57da022cae26b28a6941

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