Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9010f2967094f0…

MALICIOUS

PDF

70.6 KB Created: 2021-09-24 22:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 24ffc89b43fc8e527093b98e9fd62369 SHA-1: d9f5be44b531a992dc283f85d6d8750c1cf23d7d SHA-256: dd9010f2967094f02b886109181b268ccb9019385b66604d72c267cfb383e499
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a link farm and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful content. The ClamAV detection further confirms its malicious nature, likely as a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=kodi+setup+android PDF link annotation
    • http://arabic.cz/ckfinder/userfiles/files/77167507723.pdfIn PDF document text
    • http://soc-in.com/data/media/files/80988091689.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/17898750098.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/59013807606.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/3542329549.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130783e5987b---87190098966.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/dcee3b6777743a1df177abfa4b103e2c/73717346738.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/muvanosufize.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/65869080396.pdfIn PDF document text
    • https://fajndoktor.cz/images/file/files/19978063059.pdfIn PDF document text
    • http://offerparts.com/upload/files/gonoguxinos.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/joxokatoxepafuterub.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/77014425235.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/df1744c4eaf2d458a533c36852b653d2/dutesofekaverenurel.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/rekulitaviturisiji.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1614df90d5016c---rejuborexorolazuf.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/nubuxodewebuvabixaja.pdfIn PDF document text
    • http://trivio.it/userfiles/files/gamovorarovijunuvon.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/39270607696.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210915_225124.pdfIn PDF document text
    • http://staropolski.net/Upload/file/38679238745.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/23957139019.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e3efce9c0---5611727367.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/53983981725.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/93992919204.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161479b9a71973---68207127371.pdfIn PDF document text
    • 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_off0000b61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61E 15200 bytes
SHA-256: b844c30f215da52a7eb2fa461d8c1133b20edbe8236536dd13f3e8b9aee046cc
font_01_sfnt_off0000dcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 10432 bytes
SHA-256: c69c447b80b0805ef9d4ebe3a7d634437491c6935865553b842ebf76bb7e00aa

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