Malicious PDF — malware analysis report

Static analysis result for SHA-256 723508c6bf2d2219…

MALICIOUS

PDF

78.5 KB Created: 2021-09-18 09:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 69baad03298b8614374ce69bfc67c7b8 SHA-1: 1f5da8b5a7b7cae417e086a8655920d390090d9b SHA-256: 723508c6bf2d221962e8596135b82f11b11de7bdbc29b8d5bf0f99342d82a523
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or malware distribution scheme.

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 http://hoitruyengiaocodocvietnam.com/uploads/image/files/4763762545.pdf In PDF document text
    • http://thaoduoconline.com/userfiles/image/file/88749810862.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d92009aeaa---bejazut.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/19171019870.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/nagevirija.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/raxotelobonuloxufodusuzo.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/rabixene.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/h2hej8o1vm2j05bj2346bevcfh/40106847334.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/51512940204.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142d097d465c---2674409793.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/85977280485.pdfIn PDF document text
    • https://vpmemorial.net/images/file/8601809719.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/35688913661.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/gojukepuraniduvawesosi.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/zovusuwinanusikirunosaga.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/budopezonerusozorerukeja.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/5852141981.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/42368983533.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/duzusisemifixubutukepa.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/zunoraritilifi.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/59175973335.pdfIn PDF document text
    • http://remobudostol.pl/pliki/nodedodezoronululudeti.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161327659d89cd---91831993913.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133625424147---ravapiwiwaguwosego.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/natina.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387258d0e80---newudoxunezudenazod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=display+phone+on+screenPDF 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_off0000cf49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75B 17396 bytes
SHA-256: dd9b17f46c6a72a6ffb52990040e813ec75b6936d031b3e7900593379b023ad3
font_02_sfnt_off00011453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11453 10488 bytes
SHA-256: d66d83458e22d5e98f1887a2ddf70b1bf1fa42639704f8f6556e852cd491c952