Malicious PDF — malware analysis report

Static analysis result for SHA-256 7820c88fd98e0ff6…

MALICIOUS

PDF

71.5 KB Created: 2021-09-14 15:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ef26c8354fca604f02818d7c9df38c1a SHA-1: c9ab903027cf841c2e581455519642b36882ee74 SHA-256: 7820c88fd98e0ff6f0645c29624eaf31dd675eac594704c1d927dec0b509add0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the heuristics suggest the PDF is intended to redirect users to phishing sites or download further malicious content.

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://synerhu.ru/uplcv?utm_term=street+racing+mod PDF link annotation
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133a64bee46d---lezatumoko.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/gujedelaz.pdfIn PDF document text
    • http://vucert.vn/uploads/files/21524890155.pdfIn PDF document text
    • http://ty-int.com/files/files/nosus.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/lafibivenanivaza.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/naxonasipovoromibeleroxon.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/viremepali.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3611a8e8c---jojidasufi.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/94533932309.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134932360e5d---10902068597.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/23123060753.pdfIn PDF document text
    • http://vuason.vn/upload/files/konajolo.pdfIn PDF document text
    • https://aep-tc.com/cache/fck_files/file/monezurinot.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/11713643443.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/28519159314.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/wasomoverewusot.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/62777171171.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/96930425150.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/11/file/20210911_211200_116.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/35411768948.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/7919294808.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/86306867161.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613332e265e8b---30730853632.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210906_5FF6AE8DFA8CB6C5.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_off0000b93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB93B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD152 10576 bytes
SHA-256: 491927f74515ba290c85ce20be1b04143db85d2f98cef36cd7e1571327b942fa
font_02_sfnt_off0000e93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93A 15668 bytes
SHA-256: aeb91d020acc0d98552fe4e9dd2317fe90d00002fabaca172e81dd45a8a47577

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