Malicious PDF — malware analysis report

Static analysis result for SHA-256 e05baeddd67cc7cf…

MALICIOUS

PDF

82.1 KB Created: 2021-09-14 08:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4de49e42770a6679bdad894daab7635c SHA-1: 0fc9a6d9317aba243756fcadd9d6e56a50b1f9dd SHA-256: e05baeddd67cc7cfd915d2807bd6a63f505c3e5b46ea152f302d78e906a9856d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of numerous URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pistant.ru/uplcv?utm_term=windows+10+build+upgrade PDF link annotation
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/0ukbo7qd9oc6788flk9dnh5e7m/39811670359.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/71870553888.pdfIn PDF document text
    • http://xn--b1adrijbbb.xn--p1ai/upload_picture/67240985030.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210902192244.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/poxufapireguzobezi.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/10600434343.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/51664002864.pdfIn PDF document text
    • http://cx-gl.hu/images/files/31485284657.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/40040097535.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/sewebezimilajoje.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/lsu7a3unvadv003nh15l9ro6af/73493352388.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad7c8521d8---javuxaxasudeguranuzopilu.pdfIn PDF document text
    • https://kuepancong.com/contents/files/98480064625.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/nanirorazetuso.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/niwulutojumovaw.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/57785542391.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/gobevafasarenojewabotu.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/bolav.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/gevanexilonatujuzesu.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/giredirinipamuwufud.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/48620867731.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/noxisilaripaga.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/gesawutomozedomutemozuk.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_off0000db01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB01 10960 bytes
SHA-256: eee1c04246b6c9a28efc55a349db55042e96fa02a089ac02cc37bfebe394fecc
font_01_sfnt_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 18176 bytes
SHA-256: c8f5b5a9d015613ae9b3c044b4d2276ece671915678cbae943384a1c6747b915
font_02_sfnt_off00012310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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