Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d370523aae680b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 17:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 387239779026901147d24b0d6d9d8e60 SHA-1: ffd1630b8b9abf8555fcdfd9691e4cdc38a1fd16 SHA-256: 19d370523aae680b8eb02dbafa9f4f7cbf5adda46a863a1876364f34c3d341b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including one disguised as a download for 'VLC Lite for Android'. Several heuristics indicate the PDF is a link farm hosted on compromised or disposable domains, designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=vlc+lite+for+android PDF link annotation
    • http://back2wood.de/userfiles/file/bokebuwuxadelimi.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/58213334726.pdfIn PDF document text
    • https://kiptep.ru/file/89508260960.pdfIn PDF document text
    • https://mytopics.it/uploads/file/ramafimilijekogik.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/tudaxazaripomopozixak.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/24586597809.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/56039124655.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613735956693e---zifajevegixitizag.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161381d0ab11a8---kulibagadu.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/bopakolatelilut.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/tufunexirabagogoveza.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/xoxatalived.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/zedekavujerukuloz.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/88208906327.pdfIn PDF document text
    • http://rococosofa.com/files/files/79598524301.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/mitunalunebedopatijikaxo.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090609230673499.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/desewakazigexud.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/62919294105.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///sasadale.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/aae2df4ada0fd648111459cc5b5a030e/69061457743.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/sodowet.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/bamabiwajaxiluf.pdfIn PDF document text
    • https://manenshop.com/upload/files/70525308177.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/gabubumugeninox.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_off0000dd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD56 18116 bytes
SHA-256: 4f138d4269a1d8770181e31c1a319dcd4d385d44d0417ff694b2d1a905347cba
font_01_sfnt_off00010c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C47 10272 bytes
SHA-256: 820ff7736fc467855ac47ddc53fabfd96685cd189efbac4f8b672ea93ac5c47f
font_02_sfnt_off00012382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12382 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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