Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8c50f73bc6a2395…

MALICIOUS

PDF

101.2 KB Created: 2021-08-12 11:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3e4c3108b39914cf865feebacdcac058 SHA-1: 3289faa9b2eedf85d15d7fbd828fff0f82c96b5e SHA-256: d8c50f73bc6a23959c11d98d4f9ceeb574cf1f86b9cacdc13f086926e30a45de
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 websites hosted on compromised CMS platforms or disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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 http://acmemask.com/upfiles/editor/files/87374615140.pdf In PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/gezamopamixowafowemo.pdfIn PDF document text
    • http://teifsepahan.com/files/file/11779559284.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/998cdc640b9bec85b1faa1ab99dee94c/gotebinaz.pdfIn PDF document text
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/55637639401.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160910177e7c83---60768127003.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/5bff74750273ab287b9f3d5c9f00842a/xifile.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/zepixepomorimugiwi.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/50126346327.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/rujexananuke.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/b40f213dc2449b9f4357e023807b43d6/kinuwot.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5f13b82fa---jemokubaxalevujova.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/jafadekepokigelubela.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/ae3d9b7f5549ac280e181fa0b7872699/vaxulazosugukose.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607254cd59b78---jokuzosudazimanowibegupip.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/h7qaanlk9j29j7uu7lbjn929f6/forivivafoboxunusape.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/17470517614.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608964ae43fbe---13067668900.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///xotufatutez.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/mavivesupukuti.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/jizoviriman.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ca848cbf2---nazuvagapipofobidig.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f36b15d91---50094445515.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/weverarepepopowinumezafam.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/ad7f9345c9e25cb2cecc4050e218129a/revakug.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/65895895223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=area+and+perimeter+of+compound+shapes+worksheet+tesPDF 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_off00012072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13889 11100 bytes
SHA-256: a59984df7b43e3159a9ff78c4611e0904eff1546138cb120c864b83f8c865158
font_02_sfnt_off0001524a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1524A 19760 bytes
SHA-256: 38b5c0efc9e5cedfd961e9b2df1125742686e60aaf79b565a9f70e1227beb412