Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4799082c95f3b51…

MALICIOUS

PDF

91.6 KB Created: 2021-08-11 01:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01f50222e8021a38fdd1db9b4fc3eea7 SHA-1: bae5a555a39ca4940aba4972d7eb0b53d307ff56 SHA-256: d4799082c95f3b51984eaa5a9f0507f8c48cf828d2192ba8ba52f6089dbde2ca
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to a malicious payload or phishing page. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=selfless+self+by+sri+ramakant+maharaj+pdf PDF link annotation
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/4cace62c6555a58b055907f680618a74/woxezerejapizu.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/62472424520.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b20a22a81d0---84263964746.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/020609469481.pdfIn PDF document text
    • https://citytrafik.nu/images/file/vexexojixevazarifadaneb.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/7p99j678ropoc8p72u9l39rr6v/pidisudiri.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/73303761914.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/tifuwomofezatozilubi.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/790012566.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/ginag.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/d6d0dd2e83f7557c0728cac3705f723a/zazowidufidekefuvegem.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f23ec1693a3---tekusujigotofa.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-10/20210610081109254508.pdfIn PDF document text
    • http://gawhs80.com/clients/873705/File/sotose.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/4322828954.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/33492807768.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/zefavenaj.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/lanodakiwol.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/dd2559360e248d480654252ffbca34a6/81752187929.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/sg7nr08gh3r3eifn93cv871ft6/81647236778.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/18023347629.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/zakogivorumoferakelev.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_off00010394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10394 16744 bytes
SHA-256: 22c264e5fd867233892cef7c47ee4635e7f9b92964d7fca90d9b540f2ff55556
font_01_sfnt_off00012eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F1 11196 bytes
SHA-256: ecd7497c1e5d1b5889cae4917db12af340aba2c79d9b4c9f51ee43fd6f1c91c5

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