Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d2f1ee9480095f…

MALICIOUS

PDF

78.7 KB Created: 2021-08-02 00:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2a741b3ff2787d5feee19e136af13119 SHA-1: 375c818021ba83e8178df882d68a289de706cf82 SHA-256: 17d2f1ee9480095f1776fd8e4518cd4a5d763abd5f89c77f4a5b202b9d8a00d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure align with common phishing and malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=oxford+picture+dictionary+english+haitian+creole+pdf PDF link annotation
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/14736906631.pdfIn PDF document text
    • http://stylekd.ru/files/49683440692.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/fexeroremonu.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/0ioalfb721gr5fet4988g9pg1a/7278077575.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/towazosizofulusapelemibun.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/52695589369.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/700608786.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/86620412492.pdfIn PDF document text
    • http://xn----7sbabjkhbzbqti4a3apfmdd2s4b.xn--p1ai/ckfinder/userfiles/files/lafijataboradiruvati.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c3a14e7b4---20340588122.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c61ee6caa---21956600741.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/bjdlcp6n7cpnhcj7gs45rm2h08/48441012131.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/bolijiju.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1627277249_e3aa4de12d.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b49bc393cbd---21761748915.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/a4051d7a60217875ed2b7d8b223e533a/40032597610.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/cr5dsrjc9tu816lkch1dgi1fv1/jimurijifazepokipiwutaz.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210608_071242.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/pukadew.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a076a2943d---kovurojaxusemujatajifito.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c482b11feab---34140215808.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/517db592ba243792210a5e6390b3f3b3/25486659700.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/sexigipolowubufazexijepil.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969ec2128aa---38729706778.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_off0000ccba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D1 11240 bytes
SHA-256: 33d05a02f2574805018779752faa313cd0e800e4283310e388d6f11378c39e3e
font_02_sfnt_off0000fef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF5 17780 bytes
SHA-256: b011bdba951b52b1bcbc53dac2926922c6838c058156816c8fb34a9354b96d22

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