Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1fc88b1bf76de1…

MALICIOUS

PDF

91.5 KB Created: 2021-09-04 10:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 775108bf63f017585005237f9a55f668 SHA-1: fd73aecd2114230fbbb5d13ed89b362ef167c391 SHA-256: 8c1fc88b1bf76de1f6cb9c1a11f397787f14f66a5fcd17c538bd7a16deea95c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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://pistant.ru/uplcv?utm_term=abecedario+ruso+y+espa%C3%B1ol+pdf PDF link annotation
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fba620ef68f---rewerubuvabilizajali.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b76fce7a24---50200023659.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607427b2e3128---64346204630.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/serupokabuvutalirojadat.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/gamopozepe.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/lugemureweriragesimu.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/jds7vki1aqftij53fiuppcu981/seluvamesekegopezonakaseb.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/xomuvivodusireg.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf6356917f---19225075187.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/lojosebexiwi.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/xasuniwovuduvidotefepaku.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/rikinutasusaravinim.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ds25ag6361tjponve5l35c4703/81182671014.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/45a13e2a0aec68090a382af22cac9b53/5461094512.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/0dd129025e4e47c6981348b363744e0e/totumofobiramotin.pdfIn PDF document text
    • https://agatanorek.com/files/file/gavebododadopavadesupok.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612e1cb399b60---masosanitorilojowoloz.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/gokijelegoxu.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1de629558---tijizi.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160cab7799b159---topode.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/xisuxidud.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5c9bf08e5b60a4ddbf997e773e17be1d/gekax.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/28803216186.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/32316042220.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/vutugax.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d295959642---mewiwupefuluzivojebo.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD784 16392 bytes
SHA-256: a8f0e08624bb1e1e0b9a9e5973fd98c0e27f006c19a5f26edac2d7e091af2be2
font_01_sfnt_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001063d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063D 24352 bytes
SHA-256: bde02981a0140e5b8090ce7b8b75d07c73a8520d0926dc58c11d27af799291b3
font_03_sfnt_off0001444c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1444C 10952 bytes
SHA-256: 3bbafe7ca6eecf0c70383e6dce6fddf43257f904d65ad901e7b7bd6bfac60687

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