Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3fee373f4968101…

MALICIOUS

PDF

83.5 KB Created: 2021-07-18 21:47:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3bf5d6fb3424078c75a712562e1f2825 SHA-1: 38b913cb561c9b931d7b658130fda555bf1c50c6 SHA-256: e3fee373f49681016647cc203c82e9bcc1e5ec6572fb7fb2bbabb823f56d0ee1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to compromised websites, many of which are WordPress installations hosting further PDF files. This structure suggests a link farm designed to distribute malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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 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://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31de0422b5---86600228151.pdf
    • https://kaisar168.com/contents//files/mevenajeniwenolikis.pdf
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/0c420aca8f2ca5af6ed4a883672c3a7e/52827674438.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/bd06ffdd783333b0b296439ff39391f1/jizivuzixiberenafomotoxe.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4494d031a---10629007327.pdf
    • http://musorcentrum.hu/files/article/file/ropejakokovef.pdf
    • http://hanasushimenifee.com/uploads/files/6766690352.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/242afe6c27cf1c84ee061a772df5aa96/19798747843.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef4ff1d655---turuzuposogelisikute.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/kuf7utii0k6bj8hlc55kockif1/bidakajalefogota.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/ragodevovosopimufoxo.pdf
    • https://rendiamovisibiliglinvisibili.org/file/83996943798.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3e3b571d2---84538634627.pdf
    • http://geodez.com/pliki/file/jazememerijipopus.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8483634cf---32381702223.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160989a77e5e16---ralafejotix.pdf
    • http://tipsclubcr.com/campannas/file/mudofusokaxula.pdf
    • https://flyfinz.com/userfiles/files/21821606489.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/bde1295e50ff067eca360ae0d9b59bb7/86630174535.pdf
    • https://3drm.bg/uploads/pictures/files/rofijije.pdf
    • http://writtenmail.com/upload_images/file/bodarim.pdf
    • http://alnoorcity.com/userfiles/file/66970753159.pdf
    • http://kovacsoltvaskerites.hu/images/file/gituwozo.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cb7127bea---1050101052.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=a+polygon+with+nine+sides
    • 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_off0000dbab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAB 16792 bytes
font_01_sfnt_off0000f3bd.bin
028314da719c8d56d01240b73e48c00a6f806c1ddf460931d1ffea885451763f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 20120 bytes
font_02_sfnt_off000128a6.bin
1f28f57fe99224656c1425d773d103e5f4cc36b2f3dfee3e955e10fd17bb8396
pdf-font-stream PDF embedded font (sfnt) at offset 0x128A6 10592 bytes