Malicious PDF — malware analysis report

Static analysis result for SHA-256 beb010295862f325…

MALICIOUS

PDF

68.5 KB Created: 2021-09-30 12:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 48a8552c144a69112f479f5cabdf139d SHA-1: 569921d000c5d79b6d9e4be634e1195a7a4f6596 SHA-256: beb010295862f325df1b93848cc528e68a59315c0461dca3f6de1c26908eb5fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads and disposable domains. The embedded URLs, such as 'https://smidgel.ru/uplcv?utm_term=avengers+endgame+stream+online', suggest a lure to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=avengers+endgame+stream+online PDF link annotation
    • https://kitapkaplama.com/upload/ckfinder/files/64390697994.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/25451350818.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/39556867986.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/jemamara.pdfIn PDF document text
    • http://skene.es/userfiles/file/funeremexarulalevip.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210924222733048.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/tinebig.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/37256263411.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-17/20210917230102836775.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/94649490627.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/mufaru.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/junaret.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/remodilufib.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/zojili.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd30500400---85066872527.pdfIn PDF document text
    • https://la-klamm.org/Files/files/lukapulovaziwovexaxatosa.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mevekekapa.pdfIn PDF document text
    • http://seto.cz/uploads/94237038885.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/c20e2e1d79614871504efc428944e946/10317550381.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/59728862043.pdfIn PDF document text
    • https://unaizahic.com/Files/files/53230396444.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/55715135205.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb519291c5---94137732331.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_off0000ae9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9B 10640 bytes
SHA-256: e2046561ca27e97ecbe32437e140fb42a98aa59bbc51d3bcf271b22eea3ed994
font_01_sfnt_off0000c6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C5 14932 bytes
SHA-256: c3642bef82494bad0cf296918eb29972cfe5a75f674255e7f4d5346f502e8ca2
font_02_sfnt_off0000ec90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1