Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4d5428c20868eb…

MALICIOUS

PDF

84.8 KB Created: 2021-09-13 06:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82969ff1a177253566d63135808f9cb4 SHA-1: cc7e8a3630870e6ebf50164e4a6767f6d809bfab SHA-256: cb4d5428c20868ebffdb243713ed185e9f38e673629fc5edea4d6a4d6d7189c6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=harry+potter+and+the+philosopher%27s+stone+subtitles+download PDF link annotation
    • http://synowka.pl/galeria/file/sunovubuluzudasu.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/lamipixuvumevijopotijon.pdfIn PDF document text
    • http://nova-auto.com/upload/wikebozajulo.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/37720105372.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/30761908913.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/nuwatinoren.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/81832000007.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/kutogija.pdfIn PDF document text
    • http://planetamama.ru/files/file/61673913219.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/83192394926.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/vimevojimadozojipekuselo.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/71154491007.pdfIn PDF document text
    • http://szcftz.com/upload/24115646756.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/pozikurasugo.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368c5dcf80b---20595888509.pdfIn PDF document text
    • http://ternovykh.ru/content/file/zoviwusi.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/89700408486.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/60326183960.pdfIn PDF document text
    • https://heureka-cz.eu/files/vabubopo.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e1ffec93f85961e26b330b105a900955/32308668335.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3b1rd4p91c774t0tgbg3e21bhg/91711333475.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/70713239689.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/topapuwumivibukiji.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/87287924902.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/67968699086.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_off0000e5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FF 17668 bytes
SHA-256: 58c86b3644c47c67c87a6f0e227cc1af32e4fe01cd9c8f95334a59e338dce0ab
font_01_sfnt_off000113a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A0 10956 bytes
SHA-256: 301a6d7ad4d4206d212e8b2489372ba176ab4530106a020f5813196c8fca88c7
font_02_sfnt_off00012ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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