Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f2b320a0c32bcc…

MALICIOUS

PDF

76.4 KB Created: 2021-09-03 19:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f17f1ed771b225b351ca14bc40610f65 SHA-1: ca5317c9e2e579f0ea5a87b47a70cefa0995e66f SHA-256: c6f2b320a0c32bcced195ebe801c1805a18b0db4f20b7a9fcedfc407b33b499a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the presence of many external URIs suggests an attempt to leverage web resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://kimhoatra.vn/upload/fckimagesfile/12439215823.pdf In PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a171c1d475f---78651727711.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/giduterujosex.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/vajirabipajutotuzep.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109eaf468032---zowasaboriluda.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/sudakitejoferuxif.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ce6ace2544853511ddba836dee8d614/57976660584.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610099baeccfc---bigulez.pdfIn PDF document text
    • http://kkitv.com/images/upload/File/26732942084.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/2aa643b6f0479fd956b95e1b519136e7/beluxuxaxasofoxuroxu.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/nidigopumatagilovune.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/21102721160.pdfIn PDF document text
    • http://lokale-uzytkowe.pl/uploades/fckeditorfile/zutemaperu.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/p5dg0pc8inqjii975n4bs8e443/modoge.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/63194770978.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/34924e36248349bc3c11bb27ca65799e/zonunizodetete.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03d7da0cac---95010987569.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/ratenodidupojakebena.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/b0d6a014e32dd354afde7067b8ac398b/81702081922.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/zimopusapevimox.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/wobujim.pdfIn PDF document text
    • http://nbc.ua/design/pic/file/zafoxevopabogivisekakamew.pdfIn PDF document text
    • http://elskenecologie.nl/files/89356050179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=inferring+worksheet+grade+4PDF link annotation
    • 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_off0000c8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CE 16648 bytes
SHA-256: e7c119e979f9a686c5ccd4bb57cba3d785232ffd0954a4ea8dd6e95095063eed
font_02_sfnt_off00010ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA6 10796 bytes
SHA-256: 98ac10d5114c1196b0fe445790d4a1404bf74e8ac4567d45766c9da85f5b631e

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