Malicious PDF — malware analysis report

Static analysis result for SHA-256 87461fec9d34287a…

MALICIOUS

PDF

76.6 KB Created: 2021-09-07 08:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aae0edb8c9b94a1e92a1db55c1d97277 SHA-1: 4c07bf3a370402a0ef91745712fb607c2dd745ba SHA-256: 87461fec9d34287ae27126f0527cf975e599935e30a9d2388176a966c2536d86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to compromised CMS upload directories, indicating a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, but the structure and URL findings are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mvpartners.be/images/uploadedimages/file/67651750810.pdf In PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/12220095528.pdfIn PDF document text
    • https://protrialse.eu/files/files/62137857389.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/sudegumutasefepogumarud.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/wobejotenud.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/34332856211.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4739fc51fd---sebaziwewawaweradumegurap.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d9e5bcb3fbb---97193064947.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983ee426262---38425622958.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/51064475127.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/26114560804.pdfIn PDF document text
    • http://benrassam.com/uploads/files/91717841674.pdfIn PDF document text
    • http://dorapeyzaj.com/userfiles/file/30287141226.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/0f9828fe187b19fba6d1ac1e4af773eb/55809370505.pdfIn PDF document text
    • http://temple.mo/userfiles/file/bewenavojaketo.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083832ac7f02---20378534077.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/sixegowevaxow.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/53183531730.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160935082adc54---9913904353.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce928de266---nulitagadetotoxike.pdfIn PDF document text
    • http://merwepizza.com/upload/file/winepimidada.pdfIn PDF document text
    • https://theurbanthinktank.com/files/pijagogebikajewizu.pdfIn PDF document text
    • http://arslanemlak.come/file/masizo.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/42141129443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=5th+grade+nys+ela+test+prep+worksheetsPDF 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_off0000c600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC600 10908 bytes
SHA-256: 4d06f8acc97c3363e3f1863eab7925066bbcf221103b1774a4503f333d1e2698
font_01_sfnt_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 16840 bytes
SHA-256: ae4f2fe474fa6c708bbcc7ee3ebc70facca7eec20c639cc7e776733b0c48e11c
font_02_sfnt_off00010a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.