Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8d422a8a9b59d8…

MALICIOUS

PDF

82.2 KB Created: 2021-09-04 01:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f4722ed3c6a9bda11b2524304a00e5d4 SHA-1: 128d85a7124d1304ad39f7fe83ce0fec4fe9820a SHA-256: 5b8d422a8a9b59d8a1b396a647f329cda9bb08297b5042fb47e4a9bac2bc7bf9
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm, designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=cellulitis+pdf+slideshare PDF link annotation
    • https://pioneerlift.com/upfiles/editor/files/61592251813.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608762603b305---57858742256.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/sugobu.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610abbd523254---26071736313.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/rixanudexuja.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ff9f9d78d---lelavorab.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/63495291332.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/80701917112.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/refagavir.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/213mdgh58ct5r8tjoo1s0o43eq/53790514735.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/57468541260.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0bb0efe5f---81480255807.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/20537800244.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/nerelojisolivigi.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/87866696306.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/3dd6e7a303488a99dd6ef0dda333a691/8394679138.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/40773330113.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/47165995424.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/togudifegafigobe.pdfIn PDF document text
    • http://cjatkinson.com/userimages/7991998923.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/ccb3c226fe76872e554f547e3b548061/xulif.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/pizeg.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/jujanemonamu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9d1b04e09---futizoxigixewizevadexus.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/wagefeposi.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_off0000dc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC22 10500 bytes
SHA-256: 37edf1df40268f3b7160e81a484b8e208e7fc6f56df3296d461b79ddcf154111
font_01_sfnt_off0000f425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C37 18212 bytes
SHA-256: c5f682916f0cb98222b978f0d8880c98a9eb7ff9db491688be36a70f622cff2c

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