Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf3a2298e998cbb…

MALICIOUS

PDF

78.7 KB Created: 2021-09-02 01:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3555fd30465aba989cbb31cccf573aac SHA-1: c0d2ccef3d43f2b0820cf3c063d9f599c27c2ace SHA-256: 4cf3a2298e998cbb0c875a77f27415d076bf56f09af5146826077b4c4fb0e293
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. The primary attack pattern involves directing users to external malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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=taking+care+of+a+sick+family+member PDF link annotation
    • http://navigator-nsk.ru/userfiles/file/duzogobikanosekopiwedewa.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/gojujuzazo.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/40871131496.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160755d287e07d---81537173852.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/b6c396dd25a91b10063cc8b9ebe30d7e/97606006066.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/20df4f734183c1bf610c42b89c11ee8e/8323340080.pdfIn PDF document text
    • https://superchills.com/userfiles/file/ratadefivugawapawerip.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160992049aa318---94420711905.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/tozivosomemuki.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/6ebdb4d9ee8018dc2a73a67f5e1768a6/82484831871.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948fb5eba3a---najiseviburivoxavutiv.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/pepuxejimiwoserojoto.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/96734504467.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/39746468136.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95d03d2d9---tetexatafenelalikemalewum.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/pepagelivafe.pdfIn PDF document text
    • https://www.micd.edu.np/ckfinder/userfiles/files/zuvaxiwogozinujovaxane.pdfIn PDF document text
    • http://www.bc-arman.kz/ckfinder/userfiles/files/79216777247.pdfIn PDF document text
    • http://altstudio.be/app/webroot/uploads/file/87365059239.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/24696772373.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eec4452a3c---9599141264.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/v5lq2mqgg9l9fnl3gqbrelc17s/10145063676.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_off0000d30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30A 16104 bytes
SHA-256: 6139ca8667baf34257c20d39b3d5c6b4f1c3f6b798e6c8f971f6cdc3f69acfd6
font_01_sfnt_off0000fc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001142e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142E 10892 bytes
SHA-256: a281ae210002341eaae0d3fd8429d8a265de71bce3f38d81d99b53a33f310afd

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