Malicious PDF — malware analysis report

Static analysis result for SHA-256 e451bbb37a5eebb6…

MALICIOUS

PDF

70.2 KB Created: 2021-09-16 12:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 13c02f4df54651da2968b10d015083f4 SHA-1: 2e1624719bffd3a7b634ab01ce572a08c2bd0abf SHA-256: e451bbb37a5eebb69a6ace933ecbb8386c3c4711c359be4bf29b690ea5cd2be0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URLs point to a common technique of using documents to host redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=top+10+sites+to+watch+live+football+free PDF link annotation
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/dui49mpsqitg0hcbof85ve2497/73835810364.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/fetuwavunujitonatun.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/94792490612.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/fewanoruvabonojix.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/gawimogam.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309a0ba1cc0---38475799701.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/66295831071.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161426fd01ebd7---gomivivid.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/69596247130.pdfIn PDF document text
    • https://oktatas-konyveles.hu/term_extr/files/wusesomixodorewo.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/64228355532.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/95297652795.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/81689329313.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/b74a97594d10a08edd610e2ba1aa4ffd/12413121756.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/55t4v9ejcraavuiljfluj7905s/36864823683.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/fifosononusipumut.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/keleko.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a694dcf2ea---seladitixemadem.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/87615042739.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/gififosevifuduwis.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210904_EA1911E71BE775A1.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c85f03c2708fca617e12dadee95ffe20/pizililukewodivox.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/gevorukosoxawabemiwa.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/685lr7v8oocvcjvnvtb79pabf1/jepozojiwoj.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_off0000b3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B1 10904 bytes
SHA-256: fa1f2fad796fa938f05d963bac7e4439aed51d91f0057073e4262b09ae94e51e
font_01_sfnt_off0000ccf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF7 15012 bytes
SHA-256: f6d1c8953e024a95979f08e2ef602329a3ee60a2a372591ea7b5475841de2828
font_02_sfnt_off0000f2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1