Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b2e4e27841957c…

MALICIOUS

PDF

79.7 KB Created: 2021-09-02 16:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b08b5ade0c383fd27677b106ee93d67f SHA-1: ac86ebec3d603f0c4c94f13ba9b56b24f88a29e2 SHA-256: b3b2e4e27841957c9f83a0651cac84868d0ae7aa2146a1e65af6d757df773a70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. ClamAV and ML classifiers identified this PDF as malicious, likely a phishing or trojan delivery mechanism. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent to redirect users to potentially harmful external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5800

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://queure.ru/uplcv?utm_term=godot+tutorial+3d+pdf PDF link annotation
    • http://alexandraharris.com/clients/36054/File/gemomikodoziwokosobeka.pdfIn PDF document text
    • https://tsegypt.com/file/63245595412.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/4851188eaaf8ca36ab8976cbae098e37/jiletunanarofewojeg.pdfIn PDF document text
    • https://onecre.com/images/content/files/74090777017.pdfIn PDF document text
    • http://alptw.com/images/files/dirapekejerojuwajise.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71f3aed8b2---40956932479.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd75990e6c---setifovu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c80f905c9a---xitinudufadimogobabumob.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/wuwujoferufixivumuxep.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/o6b4ppjd6v0ehjos4lsn52nm50/buziduwagalad.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/576a97f74715860604ea79a3a5d172d6/zusorikekirejisusabid.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609272054e5c6---sulukojadebesiremo.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9243a29be---nixugaj.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/83f88cs38ipqgobp3q6ai37uvq/73508019897.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/jt34t2o5vg9231cltljfbid4k5/madesufilotekidepenojimow.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a31c6516---69408737263.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-24/20210624162729286319.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-25/20210525210758651853.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160908bf85d251---33307442706.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/37261841747.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/uadvc4d8fa6lrl16q28kpul43f/subodikopasisov.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/juwezo.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/02ri39rt7n1nqbvpqgv1p7frj9/xaxobutobidepo.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7744864c6---59803637900.pdfIn 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_off0000df5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76F 17584 bytes
SHA-256: 8889a9b99c86166764026fa0289a39457af9f6996fdd25a8731e7235786f971e
font_02_sfnt_off000124f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F8 10400 bytes
SHA-256: 53af61800cd466ea8068e17779ac03cd388fbad239314f4ac6af5b880ea39e80

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