Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45fcf73e6a03c23…

MALICIOUS

PDF

86.0 KB Created: 2021-07-13 17:31:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b3891b2e0d8fe430f19b8e60d882fd7 SHA-1: 9291b1cceaff4fdc76b7f42bdbc4290930d20f7a SHA-256: f45fcf73e6a03c23a69a548c210bf56f32297c24f72ad6c520980c448f79bf95
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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 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://medvor.ru/uplcv?utm_term=herpes+zoster+is
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/blkp3bvnucv3l5b9jsgoifq6g3/rejozoxitiwajarap.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/306nhvhhi9vkcvurqmlja4vll4/76159606469.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/89e16e9e54a47e8230f98f2339a5959f/xefub.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/lkpuvbukm35mgfbkj6ech9a7m1/73276703644.pdf
    • http://vantaibactrungnam.vn/upload/files/kafujotef.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/veninenojavozuxelawiso.pdf
    • http://szentdorottyapatika.hu/files/gobinolefo.pdf
    • https://tedvandergulik.nl/userimages/file/sapokinipugurakuwal.pdf
    • http://astro2sphere.com/admin/images/file/44011559294.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b10ee3e1e26e4e2000930fc996fb8594/ledobugajapimurakepugu.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/gcm0rn9s3cn4rea82494u7r6tt/20549299931.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dba31b82ed2---zafud.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/ade5fa242ea7cb56acb2034dbe697eb3/kepononefokekebesejixukit.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/e73501ebc78166c80c22d2b2482f51b4/88237901051.pdf
    • http://studiozammuner.eu/userfiles/files/62742031174.pdf
    • http://didaconcept.com/admin/fckeditor/file/lenadobonupulufaz.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e032568fd86---lufotaxifobujunol.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607802b57fd41---sexesewovolefudib.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/a4cv7u80erbencd10gh966b996/folaxugemewinekolox.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fd3475468---27581103706.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608804e600570---javewemafo.pdf
    • http://pulsarvn.com/media/ftp/file/towuvule.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/fojofiva.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efcf.bin
e08fde86aedcab7824d39e1bcaee63b1a94820cdea2a4ea176448c11dafac517		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 17540 bytes
font_01_sfnt_off00011cf4.bin
12ad3fe1f6a77397a1eea2e828185ed7322231c2b22da3ba5488ce1c40e37875		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF4 9984 bytes
font_02_sfnt_off00013334.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13334 16792 bytes

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