Malicious PDF — malware analysis report

Static analysis result for SHA-256 24190d9afaedc497…

MALICIOUS

PDF

98.0 KB Created: 2021-08-07 16:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 13164681951f80cef931cfabafe138ba SHA-1: b531bf1c6809dbffe01740b7ffd1979b0da481b4 SHA-256: 24190d9afaedc49742845e17131bdc5b1fc5b1b718e58427db6b85592c709f95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised websites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to a phishing or trojan delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://eska-lift.ru/userfiles/file/fetavevomadexekidaf.pdf In PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/vojevoxekavudatozamu.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/77280265296.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/93837224653.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/aee24a45410c261cd5c4c26831bbcb86/marojogodopuxebivelazegeb.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/rabenid.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cad0c53d0---93004531849.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/0esarp43fhld7j353j1dsvo4e6/98342381731.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/detefeposujolodulovuje.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/9721410345.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab66ca344ab---muxumelem.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210515112115.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744074c37c7---kefuxoruvoxixutekizu.pdfIn PDF document text
    • http://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/vorure.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/vefomolupazuxazifox.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16096ddceec998---pizuminarakituw.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/vugenitepobinusibudifo.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/kofafuzoserofomafiburufes.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/86663782699.pdfIn PDF document text
    • https://advik.net/userfiles/file/87695597322.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f888919731---39254465959.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607996e879203---nitomavukifapojeloluso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+dap+incoterms+2020PDF 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_off00011a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13264 10968 bytes
SHA-256: 3fa03dc6f0936b82499964f495dad319544c76ebb49d983d1222289528a48a25
font_02_sfnt_off00014bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BBA 17444 bytes
SHA-256: a19e572ddbbcd1055215941eff488d5010b63b2cba5bfd6af570467db3ccf866

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