Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5babae3d57974fb…

MALICIOUS

PDF

96.4 KB Created: 2021-09-08 23:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6a4eed48b8f840013d4afef0868649bb SHA-1: 9727fae392a5b6bd0018f141f212e3830c653bcf SHA-256: f5babae3d57974fb68d23a7bbf11baae14bbde8a711ac3b752b08b34b8a2554d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://philabc.ru/uplcv?utm_term=the+matchmaker%27s+playbook+ver+online+espa%C3%B1ol PDF link annotation
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0e46c9107---wixitowogigugakuwise.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/23329542885.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/dovetozanewuxonalu.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/50607712116.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/ziwitu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133b13248ab4---luxiwi.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/13150349583.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/dawaj.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/jowojekuw.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/26039139301.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/povorevuzobaxabiw.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/papesetigakeluwofutedulis.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/mudarikugex.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/soxozupubufagesuvawibileb.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/47454756994.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/37669660608.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/7974471984.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/31238846209.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/josepudasugipimaxowiterux.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/ritobuzovokiror.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161380d01b663e---23390177641.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210906203147.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/rexegivodaxebasunademuk.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/59818842054.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/pikabijevug.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_off00010ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CD 11256 bytes
SHA-256: cfd27c65d319baaa4afa4684a745f4f057dc097cda27a8edeba5154db838a3be
font_02_sfnt_off00013ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA6 20360 bytes
SHA-256: 07633fd95baa1eaceb50367e98f7e6b8a9d062833924aef07fb37308b92c1670

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