Malicious PDF — malware analysis report

Static analysis result for SHA-256 c150a27e54d2865d…

MALICIOUS

PDF

78.8 KB Created: 2021-09-21 19:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8868ecb73546cb4f8ad67dc686497963 SHA-1: 95c6a9726d732945e0cbcf654534f4c1b46b7138 SHA-256: c150a27e54d2865d96f6d3ae69126303b8749d17e6d882034406c008f5678c30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the overall structure indicate an attempt to lure users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crewmak.ru/uplcv?utm_term=messenger+lite+dark+apk PDF link annotation
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/12suvbnvp5bidhh9tfeq411e54/36770059837.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/35386795353.pdfIn PDF document text
    • http://edmunditemissions.aboutgiving.net/sites/default/files/editor/file/lejukumegifi.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e6dc7f3f5---nekimexoruru.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/kewutoni.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/sagubajagedaxukupen.pdfIn PDF document text
    • http://trieuduong.com/images/Download/74858833444.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/62758978221.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/98598167609.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146760347d1a---70539273103.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/161366c7fd80b3---66051685451.pdfIn PDF document text
    • https://andrejc.si/files/file/dojasudujibenokagekim.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/tirilarodejopojawudunedep.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/zipolimupakenup.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ece32b9b7---82503124707.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/89150054273.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4105c738c21cc5d777152b77ef85d7dd/2542757921.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/62069868187.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b01de1b6b---gujadevexowaxiw.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_off0000d10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10C 10532 bytes
SHA-256: 0f8a512e62510438a2b9d8413b755c7323f681763c8a8734dfa997ded1ca311c
font_01_sfnt_off0000e8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10100 17784 bytes
SHA-256: 33f80c448ecb39080b0841f6a658d1fae3f98c687e6c991207088573b24b2b2b