Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bcdb4e37d0c0f23…

MALICIOUS

PDF

87.6 KB Created: 2021-09-12 04:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 52dd88ca591581fb49702d83a846b9cb SHA-1: 26f522d83a59479ffebe43ea39d2e529c1ef410b SHA-256: 4bcdb4e37d0c0f23afd0f3f7d50ecfe4a0807e9ea91de9a2abd9603dc875e987
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm with numerous URLs, many of which point to disposable hosting or compromised CMS uploads, indicating an attempt to distribute malicious content or phish users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://sbstroy53.ru/img/files/nurili.pdf In PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133fe54df8a0---tixizezofiraloxukujete.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/86541017943.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/ripujasarewa.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/34593970139.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109030717536026.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/79086554330.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161312548bda09---60827072052.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/sezifofitijodojav.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ae4e570fc---gejipukafuvumabusipenegab.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/kiginadodum.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/joxamifipajuri.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/webizunuvu.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/16890811069.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/kesubafujulajewafane.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/zumevubipivulak.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/4626909771.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138508107353---46096102694.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/99352718829.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/mulosajupaxikuboberivukag.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/gijowutijoraluzim.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/49731590643.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/meresezerifi.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/49073673377.pdfIn PDF document text
    • http://airfa.it/userfiles/file/midibavopapular.pdfIn PDF document text
    • https://tch.lu/files/files/gavijebelemidobifafifud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=itube+download+f%C3%BCr+androidPDF 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_off0000e58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA5 10648 bytes
SHA-256: 71896da46347c6251052c267794309fbdd971bcfcc3c889d73db712df78a2902
font_02_sfnt_off000115d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D5 22332 bytes
SHA-256: cd1fe935e5d63e4d0ea330b57ba8be98bb7cdff513a2c04e8419ded631d8bd45

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