Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcab11dd69c0c85d…

MALICIOUS

PDF

71.3 KB Created: 2021-09-29 02:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8a304ce4876d268ab0fd6e800f708059 SHA-1: 4dec88d1d2478421436936e5730aae86d7242547 SHA-256: fcab11dd69c0c85d9ae40ba23bf30e9ed7d3f9782fb096ab0938c24a081944a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm with numerous URLs, including one pointing to a compromised WordPress upload directory, suggesting a phishing or malware distribution attempt. The embedded document body is unreadable, but the heuristics and URLs point to a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=how+to+set+high+accuracy+location+in+android PDF link annotation
    • https://willes-gb.com/uploads/files/202109240008213667.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f3cade2ed---50887015318.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/69614123803.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/nibizitebufokugofe.pdfIn PDF document text
    • http://abnicum.com/files/file/52907761352.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/godediwaruke.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/32822001622.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/64571876215.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/tusa6nu32v5117ji8lrc7emt02/wujinaxi.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/soforulax.pdfIn PDF document text
    • http://www.agot.pl/upload/file/wikuxosus.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e1ad15ec0---sarozevuletunures.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/3206953776.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/dowelodopugasesizosexuz.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/mawatusujure.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109131925282074.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/24909356731.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/tadosutilowuxeburoniwe.pdfIn PDF document text
    • http://manhtreminhduc.com/webroot/img/files/tisex.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wexedekevadisigifijokemus.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f25feb08e---fedobolizoxuti.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/75464915335.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210921_112014_4393.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/fisokuferekewiler.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/pituzabot.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_off0000b19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19B 17340 bytes
SHA-256: af03d7e21e9f22b4ef9df65d235cc0408f877c46ce3e86035c9f7d94950ccc40
font_01_sfnt_off0000de47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65E 10940 bytes
SHA-256: 2eb24a92dd6787b2d1fb28bf60cafa64013c973f1ba8997643c295dd7812ee2a

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