Malicious PDF — malware analysis report

Static analysis result for SHA-256 68eb4d1e9d639965…

MALICIOUS

PDF

91.5 KB Created: 2021-07-13 17:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 210120fd15b7b809ea5e9d541d15e1af SHA-1: ac81637f7683b1b2b2c60f74c8495f8d73d39273 SHA-256: 68eb4d1e9d63996528e6a5cbb96883258203be5626b151c1b483eb790e99a3cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://drafthe.ru/uplcv?utm_term=as+soon+as+questions PDF link annotation
    • http://energo-winstal.pl/userfiles/file/sukenapofuf.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/6id0d2i72002cuea2o52nmp3q9/nefogozegegudegafizowufuf.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cef33c2e8e---19906433836.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/pewifofejegulezufoseke.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160962aff18fc8---jilagunemudefuzebiful.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805f39f1623---25010118643.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc876ef3d64---68629575777.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/a78c0bd23704bbcef8c7eb10ce5573c1/funuzajefaxalizivino.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/wifopezawojira.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/giforijekawemevi.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/tuvox.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/88107034104.pdfIn PDF document text
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/62913325819.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/72969736298.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/bonenofabomimimegilefiw.pdfIn PDF document text
    • http://paoladebenedetti.eu./userfiles/files/46983569176.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105171012445734.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079a0d5b89bf---novemuxolevizosimer.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/94319584253.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/33705526184.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/fd9fd0a1f221db28f7335eedf48aa395/miletaduruwimabexedinenad.pdfIn 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_off00010dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD7 16576 bytes
SHA-256: ad1ecc7790694789c79666080c79cf547bae7db6bb99414c856b8dbfdaf1b137
font_01_sfnt_off000138e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150FE 10184 bytes
SHA-256: 89b77df289d56087047b3ec29c772b452c33016f61a065024031bc24bd66b993