Malicious PDF — malware analysis report

Static analysis result for SHA-256 c73e5210d644b5c9…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 23:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 33e9ae3185dbdee8dfdede40716149e5 SHA-1: 7754163afb8b1992fe15ea59f3b0fbef22b0f4ac SHA-256: c73e5210d644b5c9b7bda033fda029b2d0648fc9fe7e52049ed18a9b134e556c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • 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://nomylo.ru/uplcv?utm_term=it+chapter+3+full+movie+download PDF link annotation
    • http://jjsgreatescape.com/uploaded_files/userfiles/files/legakexulebapekat.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/rijixexogepekonup.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210904102912.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/62161156643.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/784c2a80abf55340fe595f239e399135/50216598567.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/39221932891.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/zovibumamamavew.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/31320e2accf0bdcd8093b0f51daf5371/linitaper.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/90239595631.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/44188691652.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/81218634188.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/xedazatukuzafamevebabumeb.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210913030802.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/ronokegizopufatebud.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/54423842455.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/6078119223.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/e667f99400a620deb4e9cc58ae30b88c/3385927760.pdfIn PDF document text
    • http://zuche0551.com/upload/file/65107222237.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/66142614076.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/p13i3sn7vudbn5n3vrri0i1qg4/6555210316.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/sisejapuvitutusuzis.pdfIn PDF document text
    • https://fasaac.org/temp/files/sonasavidaja.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_off0000e05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05E 17792 bytes
SHA-256: 83b9a6dcdd840d3fc5ab9dc3ac38afda6489f02f613ef20419f6638343bdc2c5
font_01_sfnt_off00010de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE9 11092 bytes
SHA-256: 7371da7d4af853b12f73344dee896fabfa09bd3ae8bee8df3068d5f0ac21a9f5
font_02_sfnt_off000127ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1