Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a9be1524d88277…

MALICIOUS

PDF

87.5 KB Created: 2021-09-20 10:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cb98317c5179fde1293449b0eeb74756 SHA-1: 5cae3108d14bdc928c9db916fb480a6414ebfb96 SHA-256: 64a9be1524d88277855ccd89cf8914a2ab4091b20f50079a6d69aa4ea35fa560
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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

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://crysiq.ru/uplcv?utm_term=game+battleground+offline+android PDF link annotation
    • http://mitcostruttori.it/userfiles/files/fedebuvof.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/fixisetu.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/93422656790.pdfIn PDF document text
    • http://thegioioto.store/upload/files/vefabiwizuwivigi.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/99235398696.pdfIn PDF document text
    • http://szjg.hu/images/file/12385433175.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/56894936267.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/92983548391.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/736hv0lsj9qreos1rbbkl4a7il/jexunakujedevupafof.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144955171408---zugomoj.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/51650991961.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/5414057106.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/rumuzisig.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/g3p3gm77eklk7ku6qro8chrnu4/64545570076.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/giganikuvigiza.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210914_175756.pdfIn PDF document text
    • http://okvin.org/userfiles/file/95246621069.pdfIn PDF document text
    • http://swotaweb.com/img/upload/file/sazibugonu.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/78104848327.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/vevaledawefogeput.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/50d7a04cc51022349af6dbf968c1d33d/85871383324.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/nufavotezokizikexo.pdfIn PDF document text
    • http://smirna.pl/files/file/22711663734.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/bubunujetokir.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/sijimomawusaduputanarozi.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_off0000f3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EF 10808 bytes
SHA-256: 8ac9f41f21ef10b0219ab124243ad5487028a403ff3690c9d021f997f551e630
font_01_sfnt_off00010c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C96 16832 bytes
SHA-256: 6c6f91c71a585feab3725cec44e00bc93c1620cf5df0dd04de059a32ad90c175
font_02_sfnt_off00013825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13825 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1