Malicious PDF — malware analysis report

Static analysis result for SHA-256 9006343245475c2e…

MALICIOUS

PDF

88.9 KB Created: 2021-07-15 22:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2eaa18b8119bc772504490d2f902762e SHA-1: 11f2a5dbef000fc0ba0ea37a9817886c7113faad SHA-256: 9006343245475c2e786af13c0e9fb922b99798cff39674c8de07190e96b06ff8
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised CMS upload directories and disposable hosting. This suggests the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

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://www.dfdtrading.sk/ckfinder/userfiles/files/7472799424.pdf In PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f03c2d3bc---92382302917.pdfIn PDF document text
    • http://f27szerviz.hu/upload/files/rosepipafotisuvipejebuj.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/hvf5s560li8n28t9i3npfbkhr3/91041551872.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/d593c812f35fe47579c73ae8ce949121/5500328913.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/kagotajegezarepejisor.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160949f46b8dbe---gomowobokegi.pdfIn PDF document text
    • http://standardamulet.com/files/files/59358121381.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/onk7g8uejoupp6519sd5aeqem1/bedajevenemomefelidod.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/076701d07728e89314fc01b768ef9eee/48100667181.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/38129705802.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/uklrp8kr1sqbjedl0et0k8hk3h/32073802335.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a133361d3---kakixenafikerofamimupa.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/5f690c4b156663cf114929e3f9f251aa/97636820902.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/ocr8nh0pnch2vtpgmsmt1pqsc5/mimezozulowamuj.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/99b4972812fc54ab66e92dbbaf59890d/60647491871.pdfIn PDF document text
    • https://samowar.ch/upload/file/17500508947.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/78231015709.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073203d19224---kibev.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16089c655588e9---29574579389.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/97658018090.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b891b16ff3d---41484567690.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd42851354f---lenepusix.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/7937000159.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606cb03ceacca---rupojilimeboludoror.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/316735977.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=blue+is+the+warmest+color+full+movie+english+subtitles+123moviesPDF 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_off0000f1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D4 18152 bytes
SHA-256: 5af29bf845e06acd1ba7ebb0ce19ea98f9b611af84c918f2af557b1c2e0ec4d0
font_02_sfnt_off000137d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D8 11572 bytes
SHA-256: ccc350654be8854e9770009f344306e87adce3f25716bb085f721a9c14c40eca