Malicious PDF — malware analysis report

Static analysis result for SHA-256 de491796f507c71f…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 23:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 07fad3f1aba1b8021dee1533be5ef3a6 SHA-1: ed63e1bcc10ce9fdf6c91a89db4d230a8a8ebf19 SHA-256: de491796f507c71f4695bcfb00cb1371d9d729cf6b35137c495839070aa62f85
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to external websites, many of which are hosted on compromised WordPress installations. The presence of these links suggests an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://coretry.ru/uplcv?utm_term=dynamite+mp4+song+download PDF link annotation
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/f84bec01006f503abb01c151f8113895/riredenukigigu.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/94050ab70c149957b247413157cb9837/kuwekigogonavexonavi.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d9b8f220e---lewajoxug.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/resofope.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/seduf.pdfIn PDF document text
    • http://freestyler.cz/img/file/57885415970.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/tomejimujekerijazako.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/b74fe475eb912ea3b79d143e980aa666/38033379488.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/51326336881.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/85762967154.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/jenifoxufu.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/sumitig.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614141565acc2---38358247555.pdfIn PDF document text
    • https://luminex.pl/upload/file/99226160532.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/gebebofobabusaraku.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/wufafafa.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109111633109225.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/nulunimugevopaju.pdfIn PDF document text
    • https://ebooksweb.net/files/file/puzugapot.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nusdvc8hr6t195nep857qepok2/lamugofetipav.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/wejapofiniwapagono.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/pinokibakawokukatidagu.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_off0000c488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC488 10916 bytes
SHA-256: 24384c5227886475312ad8d83f6fbf828c8d7241db70e4eb8bfb265432d08a0c
font_01_sfnt_off0000ddb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C6 17608 bytes
SHA-256: 280cbbd1c3b1e4d35965500c5e431ee01a7bcd3e212cde0e5fae1066c74edeaf

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