Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2985ad537ee2c54…

MALICIOUS

PDF

91.4 KB Created: 2021-07-08 15:53:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 7d4443c36b71bfac5b8dcc08a0061349 SHA-1: fb304a1e848c102f2945fad53466ed397cafcaf8 SHA-256: a2985ad537ee2c54cfabe5a0062d5673a5634a403132063f212c88519c1d7691
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites hosting PDF files, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/caeb70fa2a012800811b83552a71da37/26836587417.pdf In PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/r9ptq32lf28g7l78g102a2jbr4/mudeji.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/f1abeee687fcd232dd989dcbaadc6b92/33559619141.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/cad9f53c275efcfe1c425db027a0d53c/29159280881.pdfIn PDF document text
    • https://artenika.pl/fck/file/zevuwupi.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/25ec6193bf484f6454c0ee333bf9bb15/15151547766.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609431eabe1cf---vuwejijolavud.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/73593728827.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/87e4445b40bbd02aea6b8fad1c4cc986/27148213371.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/c31ef5ac0a431c8de34b5b228024e38d/84059471813.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/wudituwotiwitodivi.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/1eea30cba2af63e48b8c5729627ad1ba/63468749414.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/56706340292.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/bulukixufolabojikorefa.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/48690970831.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ef70439e7---zofizekinuf.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/28815674236.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/buxibovamowivizuzan.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081692b12928---pivisawamag.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/78037089644.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d3479f3ac8d7c31d3e8f3ead67716562/ginikarevugisugegaxijuri.pdfIn PDF document text
    • http://www.celso.org/download/sokewenazob.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8a33a55e0---48358006374.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/48800175057.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/1766639871.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/91925681311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=gcs+9+meaningPDF 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_off000104c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C7 10416 bytes
SHA-256: fd2eb6f16d8b41c21f12a22aea8f47f03378693fa1862a90586690f8f5f83f84
font_01_sfnt_off00011c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13476 16592 bytes
SHA-256: 465503dc845617f95a7e3a32af46cffb26138118ff8a00e8269748505c99f318