Malicious PDF — malware analysis report

Static analysis result for SHA-256 169fb78cbc32de62…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 15:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0f1c7902553d4ea2615078ced2bc8bf2 SHA-1: f189a7517697a2a127c3551c8abce11310f3157b SHA-256: 169fb78cbc32de6207016acfbb4a98689c6b8b1f0f9728cc4b4b05f825218fb2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common technique for distributing phishing content or redirecting to malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/m1q93b01bnvres3ha5f3fp6604/90649786654.pdf In PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/fuzopa.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/tukupozoxamikufemodazaf.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/27694030942.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/38484819189.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/9a7a1e249029b112eccab9a32bce3d15/92245766406.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/hen84k7jakjgk10d5r08quma31/pegedi.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c12d0ace6---wonomezerarox.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/689af596b8147627109bc0e7fd8554ae/rofukutalalesixego.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/86109598527.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a54312dd9---68660510852.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/50701619159.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/rm9uk32i4hejob7vucn1vssr7p/35767394984.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/52758338166.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bac9a7a30b---renexif.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/69276416833.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbc1697c48---75250179016.pdfIn PDF document text
    • https://banghenails.com/upload/file/7676562887.pdfIn PDF document text
    • http://abpaluso.com/upload/file/5988003408.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/47d05f03226b3bd66cfa621f174b8c30/90297555778.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a024fe19977---vurelekuguxoxekododexira.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/69869349534.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/99677461017.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/puwakadopesifuvofexo.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c353179121---nidegif.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9ac959f96c30eed6bb8f45221d8ac7ab/xasoruwiriwujireradavur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=wastu+citra+pdfPDF 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_off0000ddab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BD 18100 bytes
SHA-256: 66c1b53f338643a387ce88e1d645041d124ab88e04ee3a8947535a0e5caa9431
font_02_sfnt_off00012513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12513 10304 bytes
SHA-256: 24dca71fa32f731d41337374a2ab45fa98cdcdbc8eb1e0945b954a13eb72eb94

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