Malicious PDF — malware analysis report

Static analysis result for SHA-256 d369a7a9dbb682b9…

MALICIOUS

PDF

79.8 KB Created: 2021-09-09 13:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 89634c503b6050d4f664bb44b70b56cf SHA-1: e165edd443f29ae5ba8ff99d2a566b5cff30ce45 SHA-256: d369a7a9dbb682b941e8ece808319f26df0e8d665b868efca2db242d45ff0bf0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://irlanc.ru/uplcv?utm_term=swiftkey+numeric+keypad PDF link annotation
    • http://thrifthelp.com/flash/thrifthelp.com/file/raroti.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202109/1630501243.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/pozud.pdfIn PDF document text
    • http://suurelepa.ee/data/file/72554558745.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f452f94bab---6273826819.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133263e098ee---986869625.pdfIn PDF document text
    • https://gdaniec.com/upload/files/momiwapibozogurojojapoge.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133092792a3f---81630119511.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210901133444.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/faroto.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/72941424069.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/rawanajosuwofagok.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/425896b6e7c7807fb55b6ee7e5d48943/93977613982.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/97452504896.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/nowetalenobe.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/xezunekifabajigumozejor.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/55723766238.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/wepof.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/tububuzerivazajusow.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/jilidoduv.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/245b05ae9df7ab5e395b8a2252ad684d/7193016912.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/41876931805.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/bizozudubivulo.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/ligefoxepemodeseludale.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/65769860689.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_off0000d0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A9 10916 bytes
SHA-256: aefaf89a76a6202c06a83bc4e3f960a51a2ecb83dff818a00fc77395ab1dd155
font_01_sfnt_off0000e9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FD 18588 bytes
SHA-256: 3672990a72a425c52cfd08e8467e1412b62bed13031b9962cfe12e0ccd130156
font_02_sfnt_off00011a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1