Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1dd7de2dcbad9a…

MALICIOUS

PDF

70.8 KB Created: 2021-10-02 15:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a3ebb9d4a6e24e2eb00696426306c16f SHA-1: 6d5669f73738c8eb5383c1a4c406631c5081f296 SHA-256: fd1dd7de2dcbad9a8fb99332b79c48aaaee6b79cf8f55ceebb747a3e465aa491
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://csc010.com/userfiles/file/20210929165658_die9cb.pdf In PDF document text
    • https://konyaalotaksi.com/userfiles/file/4893182563.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/94708792019.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/kebefazitup.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/27251764215.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109240957023192.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/45339504458.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613342bccb1fb---figamoxuj.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/50656330060.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/bisetadimavepejitiwad.pdfIn PDF document text
    • https://nomortiga.com/contents/files/39043927988.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/75511745718.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/kasutodak.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/woxoxawativawelujefoba.pdfIn PDF document text
    • http://potlista.com/file/files/68097955156.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/afc400eb9a5d7d1d4a10d50809734c73/64320976425.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/31317537641.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89605327618.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/salokoxojupiwumafigugas.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/27132068031.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e19babca6---45619287944.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/wegivu.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/22917303545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=polite+request+questions+and+answersPDF 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_off0000b0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A9 17132 bytes
SHA-256: 2c23e86c348ba1ac2cd78e38290288b5b972f874100866c6443dc4d81c966c1c
font_01_sfnt_off0000dbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 10576 bytes
SHA-256: c88bee72e5285eb014568a7eed8c108ea9eeb739999c4a1e7eb83980b2264934
font_02_sfnt_off0000f41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1