Malicious PDF — malware analysis report

Static analysis result for SHA-256 740fec28a5e006cb…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 02:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 163162b6009a47d830e7665ff2295123 SHA-1: 6b5369d6ea2ada79d13eb0c4393906bf3528157e SHA-256: 740fec28a5e006cb38d9f234a9065aae3ae8170a4b3f8602a25f61425a02aca0
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the file being a link farm, with many URLs hosted on potentially compromised CMS uploads or disposable hosting. These links likely serve as a lure to download further malicious content, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://kingsbrite.com/kingsbrite.com/userfiles/file/mojuj.pdf In PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/mosunumanexizi.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1d82d95c7---rusoxufuzixat.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305b4ee7704---46189632958.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/54500622370.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/mizomef.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/96473305230.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091806014373499.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/28162777976.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/915629929.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/zemagojumizodopet.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/gezupi.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/f9b2e97e8991fb9f1da92be672940a43/vevutolanekikawuv.pdfIn PDF document text
    • http://canvangdientu.com/images/file/38844778031.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/jofowuz.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/77371675793.pdfIn PDF document text
    • https://claudiodituri.it/uploads/sakinugebafawadutiroxo.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/61507326853.pdfIn PDF document text
    • http://js-space.de/userfiles/file/91132608060.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/vetofofugabojopif.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/54390420024.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/3dd1added0660d66ee2c05055c831810/53229952566.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/winuganox.pdfIn PDF document text
    • http://farmina.ru/uploads/files/31253059118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ui+3.0+note+10+plusPDF 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_off0000d729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD729 17756 bytes
SHA-256: 4d2c32376a93c1b69ef95924791b277f4fc7fbc80ac7ba58cc9965fe10c8d5e8
font_01_sfnt_off000104e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFE 10504 bytes
SHA-256: b1f717622a3eb81349ecaf0aeb52b2550ab49540c4ce9b366be18704981871e4

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