Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09bccbcf72f6759…

MALICIOUS

PDF

76.1 KB Created: 2021-09-25 00:58:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b542370acba1905fee66f9d35f448154 SHA-1: 388a5fa9ec491def27b72c435342dd7a40ac7cf1 SHA-256: b09bccbcf72f675913d6cda538cef7e192ef7f0c310e18de2648d47b47505954
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://anitt.in/ckfinder/userfiles/files/jujagosenukoga.pdf In PDF document text
    • http://attlas.center/userfiles/file/88011998592.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/lofasanodubov.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/juvasejevefebetok.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/dkr2kn287n6erlj4o0elj0k8m7/nabopomanu.pdfIn PDF document text
    • https://estoniapools.com/contents/files/voxezirifitev.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/53057500399.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/12727143883.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/85006033760.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/47381374660.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/84555583297.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/lupinibovulumavusulax.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/asc0hrelbgkjeiekcsp488626l/3248524087.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/rexuzujafuvisima.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/514999703.pdfIn PDF document text
    • https://btegypt.com/file/sonobiwomelivikamuz.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b38966036b---64875117107.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/wabukerorozipira.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/69214013671.pdfIn PDF document text
    • https://camphacement.vn/upload/files/monutolizusavo.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/15881383504.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/24928002196.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/mizifosital.pdfIn PDF document text
    • http://emeat.ru/var/files/boxawalor.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/66262046305.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109200312332207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=parallels+in+the+northern+hemispherePDF 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_off0000c330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC330 18576 bytes
SHA-256: e1c8908db26d7eb7382d57ecd2ecfd93f9bd3bca6007f4b969e59efac91d9785
font_01_sfnt_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 10516 bytes
SHA-256: ceacabdff1da43c20e7a2dac6fe3492a0122f7d8b8f30ed37f3f026adce0ca94
font_02_sfnt_off00010a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1