Malicious PDF — malware analysis report

Static analysis result for SHA-256 8482509a9e748061…

MALICIOUS

PDF

74.4 KB Created: 2021-06-28 12:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b4fe6acc1e4983771e94201ff8c4b3e3 SHA-1: 08327b6ec14655d6e9234f9978e6553bf4cb6fd0 SHA-256: 8482509a9e7480612df591e7e0e397349c85d2cde05507fb09ec4f30055949d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://drafthe.ru/uplcv?utm_term=chapter+19+section+1+the+unalienable+rights+worksheet+answers
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/7bda03ce704d07c082f64e3b150e6200/sanozirop.pdf
    • https://zlatartopalovic.rs//files/54426016158.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b9baf2b26f2---luzigifivi.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc570b1046e---45214170223.pdf
    • http://ashioke.com/images/library/File/tujopegowuxibe.pdf
    • http://cuacuongiare.vn/upload/files/jizaro.pdf
    • http://traiteur-ribot.fr/userfiles/file/zituwelitovogano.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/fc6q6des25osf70kasc59ohn61/susozapedijekoxoder.pdf
    • http://fqcycpa.com/jingkelun/userfiles/files/20210619045029.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c8ae99ea0---fawadumutikoluxibenave.pdf
    • https://notrepanierbio.ch/userfiles/file/575660902.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/ijgnflgha8tv5uohldd71c4mcs/lajoxipakizev.pdf
    • http://creative-format.com/upload/editor/files/fowirutofaxa.pdf
    • http://kfbi.ru/content/file/zeziteme.pdf
    • https://willmarareachamber.com/ckfinder/userfiles/files/16964274560.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bffde5359---vunupene.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/d7ql32oq0cbjsin5agjd4bnk74/zeguwezetoneripe.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160875ecaadb64---jevudijawifipa.pdf
    • https://srmhospitalities.com/images/bulk_images/files/wugoritis.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa45576dc0d---mawufu.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16077aad0a12ec---kesalizemiwanupetamanaxug.pdf
    • https://kudamatsu.org/userfiles/file/wuzowa.pdf
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/1237392642.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfec.bin
c83d871f7e393c0cec65162fbd035aa7a89aea9bad7fb5e357868a02ad6f9dc9
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEC 16128 bytes
font_01_sfnt_off0000e965.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 16792 bytes
font_02_sfnt_off0001017c.bin
e2eb0dcf1421506ada1fb614df6f6f2d986e8b21e414531f562a6e74f73c53ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 11324 bytes