Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5733e02bfaf4a9d…

MALICIOUS

PDF

88.5 KB Created: 2021-06-28 14:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ccc77ae9d039cfdfbd1321dbb497edcd SHA-1: 1a7621011f1cbe3a9aa303e923df2be73bf54bcb SHA-256: b5733e02bfaf4a9d9b07d8729d36691eac516d4a882eacd2c048c439587e59b8
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress sites, specifically utilizing the formcraft plugin's file upload functionality. These links likely serve as redirects to malicious content, a common tactic for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links on compromised infrastructure strongly suggests a malicious intent to lure users to harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748d7010e43---tisisufolupuburojeg.pdf In PDF document text
    • http://jyjwqj.com/uploadfile/file///2021060402024913.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/semofarekexe.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16086adcece7c9---disurevogadojux.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/79493774792.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/xawijobu.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/29863664121.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091542b1a882---tixovasa.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d46dd22ab---79430174285.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/9f59ab3035ca4d3ff3e2bb720cd2a198/kerigugosadaxag.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30294a2ad4---lalupe.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/2lg2ma86ctut9odd80ihdbpgn0/22183847076.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b4fdd30d0---xewopagidazigazedidom.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/973c54daedd79053e0ea116f55fd6c26/34401384223.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/89528146018.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607628f3c45c5---zogekadujibilimanajimeniz.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/votuxede.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/bataxolikis.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/gofejuti.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/tedutedoribubidedigan.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/5d85b820237257bf2943b6492bf2e53a/6085681572.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/62337468824546a0d9d02704cc121d04/sasajuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=hydrophobic+meaning+in+chemistryPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0D 20688 bytes
SHA-256: fcc8a8016ce57fe995bb7ec75cb4d4f21b0028dc0dc873a4f57d52d75cbf6b32
font_01_sfnt_off0000fdec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEC 2556 bytes
SHA-256: 9116409eaf30f78b33e764cf76a10cbe98c4215fd71d86fbcf414ea23c16f8e7
font_02_sfnt_off000108ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CA 11160 bytes
SHA-256: d2c1dab179d847047b0cbf62b5690b2059ae1fa5a9633e14652280052e7e950e
font_03_sfnt_off00012239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12239 16716 bytes
SHA-256: 4c56628678d83545899146ca34c6af3aa5bbc28f29907b98ee6d848cef04436b
font_04_sfnt_off00013a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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