Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c297c45501f4f1d…

MALICIOUS

PDF

75.7 KB Created: 2021-09-03 02:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 12a4b6ca46b88bb2fffa5432c97d0aa7 SHA-1: a72119293ca6f07d0b80780e2c4d1c21487d9222 SHA-256: 6c297c45501f4f1dab47d8daad521f2fe08cebae10c415ce9dd1ca10bf9d3afb
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan PDF. It contains numerous URLs, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and compromised CMS upload links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://infrive.ru/uplcv?utm_term=easy+projectile+motion+problems+with+solutions+pdf PDF link annotation
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3c6e8b7cb---fosipigu.pdfIn PDF document text
    • https://amblamy.ee/upload/file/5123841126.pdfIn PDF document text
    • https://x-software.cz/data/file/62937591312.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/24000575468.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/xezepaw.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/xowixepixobipimamozoveten.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/lejerekineral.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/20670352947.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1610031c221f0b---52598963517.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/43752205931.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160765ceeda988---fanetisodowameg.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/e76522bc19ae4e30e680e97e4c90a981/67106952799.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611cd49c5f5b7---luniridilupog.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c851084c84b---finotirexek.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778304d7b3f---85992968210.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/51371094373.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9daf14f6bd---pefulikaban.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed3afaeef5---11146702076.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/lixazuwizo.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/52521746787.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/nowelurosumosapu.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/64266382197.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_off0000c182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC182 17176 bytes
SHA-256: 9f317113d8dcf42a46bfc3b4bba8d191f06663ca22a82cac11749f2b5580b197
font_01_sfnt_off0000ee04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001061b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061B 11436 bytes
SHA-256: 42675bf8b862ef8cf4cc22d862da88b1a9f1ff47d7416f219e7d3bb7c26af2eb

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