Malicious PDF — malware analysis report

Static analysis result for SHA-256 099d5a98a5f5d56a…

MALICIOUS

PDF

78.3 KB Created: 2021-09-24 04:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2bb90b71d98c478a0f0e95d026b79f1b SHA-1: 495c394a5fdb37a6dceb56f1081ed57f8023bace SHA-256: 099d5a98a5f5d56a9a998e7d1ea0c025d6e94aff40bacf728615f065512b3277
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted from this sample, but the structure and URL patterns are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://crewmak.ru/uplcv?utm_term=jedi+academy+ps4+cheats PDF link annotation
    • https://ratosatu.com/contents/files/27991641087.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210906_174533.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f42e033df3---sixixi.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/dipemo.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/15261467993.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/wetewiwetolevuxepagejes.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/1575512435.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/dolixitanulafot.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/lixopiraferasuwo.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/63773518824.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd7a179998---sidawitumusarubusoki.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/mupunafodox.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/f81a915a2eabf4e2f61868eb2396bf63/sabav.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/zugawipuputebiruda.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/wumarerodagutisubolubev.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210909_4B1D5EE978FEF1C7.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/94a7d4f7039a78e94a52356b65c306f9/10532996346.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/27629903307.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/27649202721.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/jenejumebifo.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/zojuvo.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/83444490131.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/zuborotadorumu.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/tasugewimusipuk.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_off0000cd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD07 18028 bytes
SHA-256: db74b656b645e67dfe4765acfd1cbb15d4da1829611f44710e4823ce7447da85
font_01_sfnt_off0000fbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C6 10592 bytes
SHA-256: 53b3081db8834274bd93e3f26e5254da2ea9e4963e93caf08182dffa01f11c50

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