Malicious PDF — malware analysis report

Static analysis result for SHA-256 97605f81c34c8976…

MALICIOUS

PDF

86.2 KB Created: 2021-08-10 12:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a225ee90e8bf5c6daffde2c66bccc690 SHA-1: 80111c8c108b5718940628ebf3a77b86703acdbb SHA-256: 97605f81c34c897618b3234715a7486e32ce44a04ad0819f258de3145dd87f6f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress sites and disposable hosting domains, likely to facilitate the download of further malicious content. The presence of external URIs and a link farm structure strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=pepe+oyunu+indir+%C3%BCcretsiz PDF link annotation
    • http://www.gc-antey.ru/ckfinder/userfiles/files/wazofazi.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae551acdc40---13158318440.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/90793603475.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5570ebbde---48401831257.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61170a8c59---65763405514.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/40765578820.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/7942404214.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/bisakawidamulowalogepifu.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/vudaxufinabamuf.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-7-27/20210727123113468231.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xawefugerozogoz.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/5682671586.pdfIn PDF document text
    • https://isleo.com/i_photos/file/furuwolewivalego.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/xozemisolatejomike.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/b91f8495fd3725624b43342420d3253a/legupan.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/tolibinisesuvunu.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/bebasitibidugupevomivovud.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/9348613128.pdfIn PDF document text
    • http://446888.top/userfiles/file/64257826702.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/gezegipiwefixubupizof.pdfIn PDF document text
    • http://ibb-online.ru/f/file/fobeluliremirubeluwulurag.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/geraguwitobilowuronoma.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_off0000ea2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10241 18700 bytes
SHA-256: c1518550b8273b0e6f250b913190c89ec59544afb5ff11ad10a14c98216d77bd
font_02_sfnt_off00012fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCD 10764 bytes
SHA-256: c1913d38996aea386cc60122ed5c62735f0954c9154351c1b500acaa0cdd348d