Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e267affe5f2ecc2…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 11:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 01e316efce8e563183b10a04bb65071d SHA-1: 78da4affd7e4b4f1eddc97d6903a87d897290fb4 SHA-256: 1e267affe5f2ecc2e1d7133f09ca65d7e95c8ec9a4a4f24e94c716fed98df60e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns suggest the PDF is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://wastran.ru/uplcv?utm_term=how+to+transfer+contacts+from+pc+to+android PDF link annotation
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138792691142---52740322789.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/44499450636.pdfIn PDF document text
    • https://mmszke.hu/files/file/zepagawemejafop.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/besepofosixabevifavemeju.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141384227eb6---88223601997.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/bixetameguverize.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/61678997303.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/43900405662.pdfIn PDF document text
    • https://kenadong.com/contents/files/vuworuxozurufixijawa.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/buxisanukirojalajamip.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/58875914609.pdfIn PDF document text
    • https://commonlawhouse.in/userfiles/file/fugoxujagatene.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bcfdb120b---lulabapiwakikebami.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/1bc3ea538dea394d843089d3343b96c6/vatopekovopagaw.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1631877766.pdfIn PDF document text
    • http://myslizdrave.com/soubory/dodamovaxetowa.pdfIn PDF document text
    • http://artdental.hu/editor_up/wetegikuwe.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/visirojuke.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/4137859482.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/26870088737.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_off0000d654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD654 17172 bytes
SHA-256: 0eb262a5a27dd98515221a9a365377c2887362f058d6668648d1109643916c63
font_01_sfnt_off00010298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10298 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAF 10812 bytes
SHA-256: 438c4882aa50ad059164237c7eeb54a260561bd2aa9f7c544be82d45ba059f99