Malicious PDF — malware analysis report

Static analysis result for SHA-256 940b89947e6c5acf…

MALICIOUS

PDF

71.9 KB Created: 2021-09-01 15:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d0398ebc9cbd54a221f596676d4d06f4 SHA-1: 2a2840417858653cca6e32accf2956b01a7232e7 SHA-256: 940b89947e6c5acf114a01652cc7caa411ec00d2f454c5144335c7790fc6271a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised websites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The presence of multiple links on disposable hosting and compromised CMS upload storage reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://synerhu.ru/uplcv?utm_term=moon+embracing+the+sun+episode+7 PDF link annotation
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b660d029fc5---podezor.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/bogifetolubutaxi.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16115319c14ce7---88130970566.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091224f7af59---42659454125.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/82867246888.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e13e5a62f81e0698e0653a2475265937/86230121107.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/a86fa04279ad6908040c44808689dd80/26847561513.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/8972803d37b4b35ef9c0d5448fbcfbbf/kuviruvuzipoxubukalegesax.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/wewesavotedek.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7f99ede05---mitisujurexudiba.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/paxosujeza.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/kavepodixusakodi.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/80832256499.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/sefezujaboro.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/zikolij.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/77129370650.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c080a2afe48---56599278621.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/bixepisomawugewakax.pdfIn PDF document text
    • http://petrduchek.com/files/29189372686.pdfIn PDF document text
    • http://jonme.net/ckupload/files/kuxutiwurozufevinujoroj.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b04081d21e8---puxoba.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/10127297412.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/xajufifizeme.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/torisafekezik.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160955cf2d2da3---48383971613.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9094600613---najupawudedokavage.pdfIn PDF document text
    • 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_off0000bb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB2B 14484 bytes
SHA-256: cc2cf4ab2311eccdf31453f068a7d94d49a3589c475fc84cda797c01241951dc
font_01_sfnt_off0000df10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF727 11200 bytes
SHA-256: c5186a773c3ad0e23a71fba535c92be7d042744132ca034669c3c521db6f0daf

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