Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb233f82d630c9b…

MALICIOUS

PDF

76.0 KB Created: 2021-08-27 21:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e5179a59db1bc41648ff87bd5ce49481 SHA-1: cbc971d0bbdbf3c19dda2d3b810f1dc5b8291cd6 SHA-256: dfb233f82d630c9b9e4804a996fbb4063fd31402f4bfa9349f308892bd031341
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document contains numerous links to external sites, many of which appear to be compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pixomot.ru/uplcv?utm_term=ssc+je+general+intelligence+and+reasoning+made+easy+pdf+download PDF link annotation
    • http://yuha.be/_files/file/nuvudipovuwi.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/pofufalonilik.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/93474963211.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e944eded4---pibugofakutoraxavol.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/wewagesaziv.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/20324443580.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/9828780281.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075f763c92b7---bofefapazukonotovolukak.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077aeb4abdc8---54861038379.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/jexawaxozifefetotakodazaj.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b718d98fd37---xutuvepubow.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/bakaxeriw.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c686acd2874---57042604107.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/27684184586.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/69108810829.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/57816151087.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/f3601978a8c79006d3ef756b8eb18ace/52053636999.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b5b93dda44e82aeec426068881bd33c5/66718711079.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/vapuxabopinekutam.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/bpuht79nidjpkqee4irdlpqdi2/xurixumuduboga.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/doh4se02c3i2h2n514r8ma26fk/48105631852.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835dd46dd3a---solovakimirep.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/sefivebaretezaguzu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094be1f5afbf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 16024 bytes
SHA-256: 3202f4e44c1ec7c0f3ea042b8b527ef85ef8aafa3887a9b4d9f74b501e96887f
font_02_sfnt_off00010621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10621 11368 bytes
SHA-256: 002d29ff83fc727c0642c3554e07519be1c88ba4dd606a050d8ac9dc100c5b9c

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