Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b36c3df5049079…

MALICIOUS

PDF

84.8 KB Created: 2021-09-20 07:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 130f96ffd7699f63abeb2aafd851a7a5 SHA-1: 000a1dbe5d2242296d6a2d45fe9c38d6c9dacd28 SHA-256: a2b36c3df50490795631093ecc5e3621881bb5f7e1ce3c0079e69f132d094560
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to various websites. Several of these URLs are hosted on compromised WordPress upload directories, suggesting an attempt to distribute malicious content or conduct phishing operations. The presence of multiple external URIs and link farm characteristics indicates a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=gta+4+apk+file+download PDF link annotation
    • https://makiriaszto.hu/ckfinder/userfiles/files/mejunatorapimumog.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b037d1d3bd---45463555194.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/takafefasawisodenigi.pdfIn PDF document text
    • https://raljob.com/userfiles/file/rapafazewire.pdfIn PDF document text
    • http://isvpro.com/custom/files/34607450379.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091521574685.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/pixidapitigikezid.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/65035026266.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/lawexemikononupofadu.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143051a38c16---lojuweliduzevenuwedajas.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/4378242877.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/vulejulatunirobajatebavo.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130742b665d0---vixuje.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/cika76h25i37n02b070vol27s3/votinawiwaze.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/33395841523.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/volavivunemofijojes.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/malobobezogiwepazo.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/lakize.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/24310148793.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/doxakipejefi.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/61976938814.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/mulufu.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/vavevulu.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_off0000e805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE805 10520 bytes
SHA-256: 1827661f7c1332adfeed3322ca35ea07c737dd36ba640f74e50c7d5783c96dab
font_01_sfnt_off0001002d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002D 17628 bytes
SHA-256: e904316e18c7243c7384dccae3171f60c391ca98eaac4763806486fa24508545
font_02_sfnt_off00012dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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