Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf321d0715ac9bd3…

MALICIOUS

PDF

104.0 KB Created: 2021-07-05 00:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: abcba30713881e728107d7522a8e4e23 SHA-1: f032eee81c32e668af9ada2667a10d4493dbc34c SHA-256: cf321d0715ac9bd39a8de86a400e36e6936aec326b5a63561d38b797708d26e8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing attempt. The heuristic 'SE_FAKE_CAPTCHA' indicates the document likely presents a fake verification prompt to deceive the user. Multiple URLs were found, some hosted on compromised CMS upload directories, suggesting a potential distribution or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9847

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://batiment-tunisie.com/userfiles/file/6152099539.pdf In PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/o93p3mjictld9r7n4q0lia5bfb/bobelejagisos.pdfIn PDF document text
    • http://jkohut.pl/file/3271981324.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a0046061006---jurazagexu.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/xoduxefa.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/880kovqoe8soc7eqafn92d79d1/kanusakusamopejerupa.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c0db6e1b6e8---77353911460.pdfIn PDF document text
    • http://iworking.vn/uploads/files/83489136144.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/dosugorodofigagezemi.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f118b059963a4318c02e8be12b8e8053/25545358525.pdfIn PDF document text
    • http://ubest.ru/images/file/94328616303.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a330819e76---69017448435.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee34b97068---8488429598.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608008f958e53---mopubokegijovakukujibibi.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/0c963f99478b07bc745c0582406199df/56747242577.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/95837539864.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607979849639e---15498045670.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d2f80e91a---tenobevezasenosojaxakame.pdfIn PDF document text
    • http://guowangcable.com/d/files/89010047814.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/xaxuzejazowozuzakusituzat.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857dc1c30c6---pezopulenemewonivuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ness+definition+suffixPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001654b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1654B 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off0000fad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD4 24140 bytes
SHA-256: 079c5482f9ba11ebc480549c9eb99e9d3c57891d0aa0f02ebaa6347caa97d5e6
font_01_sfnt_off00013623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E3A 10216 bytes
SHA-256: b63189f5ca3431a478670e34e4f130d120692a70f8f7fba085b4789a54f4b8dc
font_04_sfnt_off000182e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182E3 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff

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