Malicious PDF — malware analysis report

Static analysis result for SHA-256 c518198276c526b9…

MALICIOUS

PDF

69.2 KB Created: 2021-09-29 08:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2782363fd16d6b1cb36e1677785c56b9 SHA-1: e5b1db88c9578e97556e7d2995f29b445efd01eb SHA-256: c518198276c526b94d94a8da5a003f690a3da9968cc4a3f149aefc6a3771c943
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL distribution strongly suggest a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=double+bar+graph+display PDF link annotation
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16150de19b52e1---24812006995.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/13857537144.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/96934a40042ce626c39ee87c5ce68b53/3512182694.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/701931790.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/94324750644.pdfIn PDF document text
    • http://househouse.it/userfiles/files/23750036863.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/9778c56ee5db8f20484de978b47892be/44439138542.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/15618002861.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/83479018992.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/9cf53b7b5ea0523970de522a6b4db06b/21552526179.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210913_85C39986DFCDC040.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d42a5a1ad51a60e5f6ddd8802d7f24d2/90254375756.pdfIn PDF document text
    • http://web5gstore.com/Files/files/77942313205.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/pijuxifoline.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/sakodifodeworuxosufemena.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/55662310006.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/zerajapirudeni.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/63476578490.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/lajukaxoroduban.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/16334064971.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210905_30572B6C6BFDD40F.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_off0000adea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADEA 10824 bytes
SHA-256: b741e418119ef3a873c8fa224482a46fe997c6d11d98260208da393c7ce1afa5
font_01_sfnt_off0000c689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9B 16104 bytes
SHA-256: 97933036a76c9d0e836278e0547062061e534ce420566f71eb0ccaf13f5f4cb4

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