Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8acc69c5e17e6c3…

MALICIOUS

PDF

84.1 KB Created: 2021-09-18 01:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 80251804c3b8701e0c7701ff338058df SHA-1: 6c66ae294899a322563a382312aea77725393e57 SHA-256: f8acc69c5e17e6c3cd78c8e46f0c077e3897ee9e2febee6f6dfbf6973603222a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true destination of these links. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://huntic.ru/uplcv?utm_term=how+to+disable+silent+mode+on+android PDF link annotation
    • http://hiroshima-teishaku.com/userfiles/file/34537557649.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5hee2c7cb6dr4n816c37vceos2/zuxikijutixoreparoxebixi.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/karawetawixafanojivas.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/161366a4195110---63351518641.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/raxixuzapesuvoxipenovasu.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/49618209599.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210916033325.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/jovamuj.pdfIn PDF document text
    • http://gojjang.com/uploads/files/46156534859.pdfIn PDF document text
    • http://snft.ro/media/file/lofededuvetojifisizixa.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/11764399498.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/33783116975.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/43677921121.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/10753266209.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/fidanelirifaw.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210909_085206.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/sifilusoxosati.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/dixavofonuvorax.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/48663138358.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/jeviduxaxe.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/metanuwukos.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210904_222647.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/vibotenufilax.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16137642b3b322---27981144310.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_off0000e25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA72 10628 bytes
SHA-256: 4b9e86ddffc24de14cdb2939fbccb07275fdc2f464fedaef85f57bafd3c69d12
font_02_sfnt_off000112b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B3 18344 bytes
SHA-256: 11f5b101a597df9c47f8f779c2a27043e7a4f626db20ccbf7384ff7423b164ed

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