Malicious PDF — malware analysis report

Static analysis result for SHA-256 4952f728cd671e22…

MALICIOUS

PDF

88.3 KB Created: 2021-09-06 14:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 239d20fe49bb5280b6b589757ef90925 SHA-1: 17a744517e726588f6dee7ef927a93a466d68f83 SHA-256: 4952f728cd671e228c8b6658791e0b7dba8f38af7c82686d4f87d7edd8ea3f41
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to websites hosted on compromised Content Management Systems (CMS) or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://jadever.vn/Images_upload/files/tabomub.pdf In PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3a8a90cb5---51289254847.pdfIn PDF document text
    • http://wardwrightself.com/clients/863644/File/vorito.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/xanikirukosa.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/97741773540.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095aff610a38---63903963001.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/0ccce232730b8a895b084173c24ddc26/sorejoxe.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/mevenukerajuxisa.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcae537327f---81905498416.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/e436qqprq8m1b8ngbglpvic99d/50283592575.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210704_1D2121E5039880A6.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/sevotepesagunires.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/05a13f81b160f39b4e86f2eb37141f8e/diramolejesozowewevem.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/77149801654.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/66179384270.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c416777bff7---62334994126.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/xonuvodud.pdfIn PDF document text
    • http://envigest.cz/upload/file/57307466318.pdfIn PDF document text
    • http://riversedgefm.com/files/file/42771940881.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/65912886145.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/70877977161.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/20088634144.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/44798409883.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b42f267a0631eda8d63fa99c411b55cc/87403214677.pdfIn PDF document text
    • https://basisangka.com/contents/files/rurakovulinepitoloruv.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/15686220486.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/xozagukejokupotijixepuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=tinkle+digest+1+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_off0000f340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF340 18840 bytes
SHA-256: 04ebd594259a9159dbcc82eb88985019fbc17e9a75652c47da299fc18b3fe292
font_01_sfnt_off00012456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12456 10396 bytes
SHA-256: 16b48c605216506b71ad45ecd7169330d460f7ab0a2b7ef7c7f0d7b388f3c63c
font_02_sfnt_off00013bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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