Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e2dd14f6c86e308…

MALICIOUS

PDF

77.9 KB Created: 2021-09-15 23:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a31c3b54e6540b9852a80b3cbd106fa0 SHA-1: bf361425574c0487510fd09b4c7bdde8d25235c6 SHA-256: 4e2dd14f6c86e3080261ff14351e7c260e14a2adab30b2da9b8a6db18646c4cc
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 of which point to link farms on disposable hosting or compromised CMS upload storage, suggesting an attempt to redirect users to malicious sites. The presence of a URL with a 'utm_term' parameter related to game mod downloads further indicates a potential lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://infrive.ru/uplcv?utm_term=homescapes+mod+apk+unlimited+stars+download PDF link annotation
    • https://sim2007.com/files/guvaboruforog.pdfIn PDF document text
    • http://atoutslegion.com/userfiles/file/97560350565.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/latazi.pdfIn PDF document text
    • https://ptogel2.com/contents/files/tapilo.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/wevovu.pdfIn PDF document text
    • http://iscelenie.info/files/file/62815873755.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/kimerufitedibazebifet.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/wuzorirafopupinugubimax.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/zawamofesedigebu.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/vikidozujidozutoremelod.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/luzoxibefatawobemovo.pdfIn PDF document text
    • http://stylekd.ru/files/16986691812.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/sejepolanofenepino.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1a12759be7fe1a920a734dced6b4a757/gesasizoxaki.pdfIn PDF document text
    • https://0900107678.com/upload/file/86015970584.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/xuxadetitadabop.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/82867570829.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/70e65ee24b4fbcfe23bde7485acc2492/togetoletil.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/86625094272.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/60159171267.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/fafik.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/vewegigafosuz.pdfIn PDF document text
    • https://vestol.bg/files/file/kunuzijipogegijage.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/tepekikatejuboxoso.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/jezobizenivuditejezegob.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///202109044851_239730008.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16138d006b95f8---76203163606.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_off0000c19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19E 20984 bytes
SHA-256: 82593b3bb9a08f582c078ace5d9d1618dea17bc4740ea41ae1ac3e7b03bab32b
font_01_sfnt_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 10944 bytes
SHA-256: ca4ff16f34ac2ea6593fa164b6b623387e1be78c4b06a302e91b9ab22f8ca796
font_02_sfnt_off00011160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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