Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86cae2c06b93320…

MALICIOUS

PDF

91.2 KB Created: 2021-08-10 19:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 819f6dcc4ba731a5fd1c73bbb9a16e59 SHA-1: 0d9f722d6f6776da5566ea8845eefc949b48ca41 SHA-256: c86cae2c06b93320f486888aeff689957c00886ab16e218ded240ad3c472a08b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://chcial.ru/uplcv?utm_term=how+much+is+6+oz+sugar PDF link annotation
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f85e847f1---20103664512.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/cgdbaj8m9s2076349ats7gqe40/jezetuxisefawadased.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/fc709a55a5578950740d513ba47fcecb/4312819830.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/8c07e227c0061b064c26631c64099575/44523139857.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/6476906614.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/58759738270.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609037c47d34a---66408836323.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e085d08eab7---domavovofujuwedutukavijag.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/navogiveletopus.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ba91ed208---xaninisevamum.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9befcc309---13365572938.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/19349974474.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/b8acc222883d907b9a2b662b764d91bb/75101338672.pdfIn PDF document text
    • http://a-pluset.com/userfiles/xugosoletezano.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/44757316354.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/dikusefafudak.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/s8c5omn81gv4s79k4pqbgg2enr/nugik.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/otktdb777qk8q94aou8priftv6/59576095504.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/wuzopeg.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703117e885e---80835022087.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/mupirexanakixet.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/mabizivirunebobedafalaxer.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ipsm7ugd74crtsej47b0ukcod0/36856179362.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/51unrmeoo59mrr5dmi8t87kjr3/mimenosowutuzovodowufe.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/64414ee537458f0979e1571bf74a3044/demem.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_off00010028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10028 17452 bytes
SHA-256: 73915ee767eb2126b31fbf6be82d52dcbe594a5bd6b2381a2a0f5b2915634e24
font_01_sfnt_off00012db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB5 10704 bytes
SHA-256: d0ce6110ef72baf70e5b98604b10707e50257676e6073659d64aa5df5f7eb921
font_02_sfnt_off0001465b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1465B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1