Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c3d613fe2cbb6e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 18:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d07bead7c7655c2b899d4ff948458ac3 SHA-1: f21a15bbe5bb4d10748158a66ea0d238a4c6582b SHA-256: 81c3d613fe2cbb6eabb051f7f13eb35a91d7a64dffed2fb59eca54667141ec29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of external URIs and link farm characteristics indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://uniquecharacters.com/upload/files/98025685972.pdf In PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/33721c05b850af8cf927fe4d93ff637e/nakomaworepameparagakamuf.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/30b493848d59c9ed4402ab3ceda9d658/zamakajizuwagonala.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/v91pg0scvp3h7mbs33rbmh2tg4/taxuju.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/21d72f376da103924526f9380dfba897/58802385903.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/dumojajalijigebafedonup.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/53f8aba8b16c54a2c03538d07de535e5/53834486045.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/28383642252.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/34213820374.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803c7538c57---83736920883.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074d18cb6691---40992451210.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/09f25abace14f76f6929653d41edf2c0/42382520406.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080c3dfa4618---78059749619.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/buzobivasela.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/83908997124.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/lazeniramumodajelemufimot.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/43fa0de870ed478ade933f315e0e81b1/54964536553.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/45601209528.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106797269671---44876175933.pdfIn PDF document text
    • http://specimport.by/files/files/xogun.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607509447adc0---11791243879.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/81510463692.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/zatibunumimivibup.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/27de3c0ab975b1fe2d8bffc247400c6d/99855246663.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16070a1d380cca---pamerakumujexijasu.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/81604612286.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba876e60f---kikivuzelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=1+year+experience+java+interview+questions+and+answers+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_off0000de49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF660 11268 bytes
SHA-256: 2afe46c527963605519ebdf5650eee00fe11c16390ec52be86ecf51fed189bfc
font_02_sfnt_off000110d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D3 17500 bytes
SHA-256: 60e5263883258627dcce7c3cc159f1307e734a25fef42a5da4a1f03f2c22c4c2