Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb45b13c3fae9ab3…

MALICIOUS

PDF

71.2 KB Created: 2021-10-03 23:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e510afd623c5e9568a42a09a5ea87c52 SHA-1: 22c6206655620692b90059c5c367ab0ef4ada534 SHA-256: bb45b13c3fae9ab3b583c51f2ccd3646a4d4e47e7a986fa531961fa8ccb81878
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites, often as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://loyallcanada.ca/editor_files/file/kebikeberabunude.pdf In PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/jakozelu.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/medovigidozejaje.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210922223145259.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/tozes.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/94800701834.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/jukit.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/87040924742.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325d05aeb71---waxukelepojimifikufu.pdfIn PDF document text
    • https://swiz.eu/files/editor/nitewiziwogu.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/62520194478.pdfIn PDF document text
    • http://mobil-tech.com/files/56849590023.pdfIn PDF document text
    • https://jfava.gemwareserp.com/userfiles/file/durutadanezofuruxabex.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/lesekuw.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/xabaniwo.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/26077724676.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/8244398842.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ut7tca9h3jqvdi4rnch83gck3j/54489468066.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/28893133817.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/vimojumuvapipogikipukit.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/74154770290.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/74349960265.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/gbto2j1ccc6m6dciet84o7tftn/72393592374.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=diffusion+of+innovations+1962PDF 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_off0000b242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB242 10604 bytes
SHA-256: ce3c635dffce41070d9764caebb5859ce4dba92e7d00a45a2e8daa67d11e66ce
font_01_sfnt_off0000cab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB4 17400 bytes
SHA-256: 47eb14d56290c5c21868752a535313a368bbab23f02acd3673d3565baf32af2f
font_02_sfnt_off0000f6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1