Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d85802bd4453a0…

MALICIOUS

PDF

70.5 KB Created: 2021-09-05 16:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d12aa4caa748219bfe4b67524bb7727f SHA-1: b047b7acd8754d7a6727c414efff8a6ac0cb471c SHA-256: 36d85802bd4453a0cffee0986e56974b7c31c15b8cdb1d9aee9c524325b75f97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to multiple URLs, several of which are hosted on compromised WordPress sites. The embedded URLs and the heuristic findings suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/7e54a2b090ed9f5b35256b5c4cbba663/mokebubakositikobokumoto.pdf In PDF document text
    • https://aashianarealty.com/file/29624798285.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/5d82e7a345928c9695bfe9442d26a09a/57684303980.pdfIn PDF document text
    • http://cycling-software.com/files/file/78557161025.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021062821594473499.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/61202919935.pdfIn PDF document text
    • http://emeat.ru/var/files/desisidigeposipug.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210817_67487892CB0BB64A.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/zurasorej.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/6a0413d5d04c2d4e6ac031179bd23f75/70354075970.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/58442502460.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///robijosexeronitonenogi.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ff5989953---64851212659.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/79010569869.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/5ba09e5cd0371421c9dc043ef4223bbf/27808499178.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/loxufemurule.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/wukufuzevoxovaror.pdfIn PDF document text
    • http://tyextractor.com/d/files/kagopajemud.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/pajenofo.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/42355398389.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf0fe82170---josuxe.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/22297122297.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/75471633116.pdfIn PDF document text
    • http://merwepizza.com/upload/file/52383120045.pdfIn PDF document text
    • http://sooclose.eu/upload/File/39553644890.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/47306223670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mineria+ilegal+en+el+peru+pdfPDF 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_off0000b2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DD 17236 bytes
SHA-256: 96edf823ec8cd9fea8ad2e3c3e0fd2dbf2b2f5e4d75b9af7e5a1f9a46cccd907
font_01_sfnt_off0000dd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54F 10380 bytes
SHA-256: d9e30664110009c01d6a83855786b4aefbebb11646b4603ccb1b4df30928ac12

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