Malicious PDF — malware analysis report

Static analysis result for SHA-256 624a006cf6e9aa86…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 18:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1e0b1503849407177d3b2446efe2a215 SHA-1: 6c47a8cda91b96698d5e0a34198bb8a344d128af SHA-256: 624a006cf6e9aa86f23043e1126914372a0728ee63393682fb9d9304f1ee4eca
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF-specific heuristics related to URI and link farms supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://thetestmag.com/userfiles/files/rozigobumumimumasadetimom.pdf In PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/90989870744.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/84803604056.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/ralex.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/gusigodasagukuwure.pdfIn PDF document text
    • https://robustbrakes.com/administrator/imagetemp/file/13888829803.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/64803344058.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/17912251949.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/165169174.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/a1d399cc9dcd5da12b91201e382f4328/xililirikev.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/wazalikomijisotosojum.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cac6511a1---daxugek.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141117534663---59698070402.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/94092452105.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/wuviwokoxaxakivajig.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/temilogipuf.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/20fe4b928b32e864f47761de6cb8b64f/finegamatufapaterowuga.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/bisefot.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210903_EEA2BC9941F4297E.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=hebrew+matthew+interlinear+pdfPDF 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_off0000d2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACE 10692 bytes
SHA-256: 0c663568071f7a4e770b8f29ae981d9f4b0da2edcaa861c2bf8003a55b628785
font_02_sfnt_off000102d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D6 20640 bytes
SHA-256: da8e7b1a6160837be6f563a85eead11032733a6e131805d34a31007ba545e379