Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82f013d80414e1d…

MALICIOUS

PDF

72.6 KB Created: 2021-09-14 02:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 71740f746d8b49e5105f55114ff1565a SHA-1: 14cfe297240a8e9976575c41dae3fac066df187d SHA-256: b82f013d80414e1dedcd059322a9b65bb59b470eaf8194db37578c17f1210a98
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised or disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of numerous links, including those on potentially compromised CMS uploads, reinforces the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://karaari.leaddeehub.com/userfiles/files/62043227351.pdf In PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/befemaladeriraj.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/72716294098.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/88707336272.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/tewuxomufitomemolex.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/kifalebupeg.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/napirofalitasagituxajawoj.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/fixofubuzavagefusupixijoj.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec12d6cf67---tidakelawasixamaguvurawof.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/lurizejarisegag.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210911_183D3DA8456E0552.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/103249794.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/20a6dd71fb91fe49afc5e945d5f83059/72525651557.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/sajidiwowo.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/78617718117.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/23984646153.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/xivalubaginemipulenabop.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/depukus.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210904124758872.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/xanataliluzuzikenemir.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/77345885689.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/nezofanafefowomod.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/96477552495.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16131a35c3074c---66715924900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=difficult+sat+math+questions+pdfPDF 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_off0000b8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8EB 11032 bytes
SHA-256: 6042b7fed2933bc5ee6a63df332944b51272bb0a66a9c7ee7e9384ffc3631fc4
font_01_sfnt_off0000d229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD229 16380 bytes
SHA-256: 541709a3ee4fe7c53e181d0c8763fce4ba0526b52cdee3cf4d4ed5423e1f5d92
font_02_sfnt_off0000fc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1