Malicious PDF — malware analysis report

Static analysis result for SHA-256 004aa8b0cdb540ed…

MALICIOUS

PDF

77.2 KB Created: 2021-07-25 05:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9ed8394a53959c166de183009dcba2db SHA-1: 0dc3e8817d35e77283181ec625e93a41b7391a06 SHA-256: 004aa8b0cdb540ede60af0b438b522a121c64c87c4e5d627212428a54d860526
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pngroup.pl/ckfinder/userfiles/files/18273819096.pdf In PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/vovuke.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c306c1cbfa6---bevejifuf.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857b8944b6a---74412219268.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/69345041786.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210522171233_175276859.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607889a4830f9---53916250162.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607852b2473c5---dubasukuzadopeneferabig.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/10677284800.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/79901948163.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/selisararurupurepegadutex.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/b35ac77cbde637e4616ca8271039e010/xefaxifutajavivudujuvu.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/33962947949.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59c4e9076b---4513647082.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/9ba8ea22144927258b1380a917449f83/16567047512.pdfIn PDF document text
    • http://princeton1959.com/clients/863834/File/loxusomifusujokobulesas.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/sokugajobagisa.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d0ee3e50b---74212094543.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/98438635006.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607df49a4230a---45200680842.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/zitunagaxenarezik.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/pakeroxusowag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=minna+no+nihongo+vol.+1+2nd+ver.+w%2F+cdPDF 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_off0000c98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98C 10800 bytes
SHA-256: 97893dc04a9146393d30ad17728be67ceffb31649ffc2bd13c9d5f1a8803db8b
font_01_sfnt_off0000e24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24F 17928 bytes
SHA-256: 2049abc604772a2cade867aac3c4378a45044a0965dab60cb7b8e0f1aee6a8a5
font_02_sfnt_off00010fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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