Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33a603edfc0f5ca…

MALICIOUS

PDF

74.9 KB Created: 2021-09-28 12:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e4cbea55897a916f11b411e1390f3131 SHA-1: 159695d4a40682861fc33f2f4da193cc1d2e8958 SHA-256: e33a603edfc0f5caec616c858ac02582fbe24edf0bc071dd006b2ca4f119a8ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common method for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://climtech.com/files/files/77205254311.pdf In PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d84994bb6---99288754967.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210903_B1610E4381D40CC8.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/17018891114.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/17002688618.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/viwaku.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/98369626516.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/11724234074.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/25626134758.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/26986682069.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/42374039982.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/f7e8dc21bc98948f78392ab55bd50294/72387380475.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/67308921042.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/megaworubefikaduviko.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/52260322513.pdfIn PDF document text
    • https://tierlistei.ch/downloads/pinetol.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/vuxuzapidapedovosudope.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/879049196613253c898ad7.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/zexejujeri.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/915004602972a83ba5f5c9adcc0a7c9d/37792614298.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/82989416380.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/4022386474.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/botagodimugunedunor.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/92426412655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+download+play+store+app+in+external+sd+cardPDF link annotation
    • 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_off0000bc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD475 18904 bytes
SHA-256: cab570cce3d94fe385dc16cbcb48bc01739cd125ef18d19377b5751640c809e2
font_02_sfnt_off00010454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10454 10800 bytes
SHA-256: bf8b45ef26cf57552c1e93e49d556fec5153ba8b43110f9e5ec056edff8f45f5

Open this report in the interactive analyzer, or submit your own file for analysis.