Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c3a98646956b05…

MALICIOUS

PDF

83.3 KB Created: 2021-07-08 17:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b3679c564715f98288f8632ba6ab5fae SHA-1: 3291bf1c7edd9ed1417fde0ce14eaa1b1cc7f204 SHA-256: 05c3a98646956b0572d6c17b4feb9c668d7b49d134cc556d82a60acc92a7957e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a large number of links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://studiomarazzi.eu/userfiles/files/pudovebamuxo.pdf In PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16082b792cf804---84975002666.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/43845424863.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/runpvpga3g568iequiq22hoocl/14437744800.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943231f403c---sewazapodewajemidib.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d45ba62ee17---febosigexijutomebifizaxud.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/79715221529.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/cf5262610068f89e6116ba8054daca4c/piziwazufam.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/paboxiwet.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/2pc8k0j0a7fng6u01bpkv1eq84/22602958067.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/28186991ae7b6315279ef943f574a32a/30662406372.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a65bde41976---22781559020.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607f893e5f14b---43841671709.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4d397c845---34556477599.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/badex.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/gatafevikevo.pdfIn PDF document text
    • http://asustainable.com/global/file/81678011576.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/waneregixirotetalaxo.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/49695034685.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/14345724652.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b555792618b---wuzox.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/82263068554.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/nerodevumelobuxamoros.pdfIn PDF document text
    • https://ebooksweb.net/files/file/suwibom.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/45838440888.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160711ef5261c9---87386745509.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/d77638cf8ebfb1fffd1e588595ca7ce1/95694695116.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea0d83a2ed---kisejavodoxedonafibaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=commonwealth+attorney+officePDF 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_off0000dfc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC5 17504 bytes
SHA-256: 3caaad90e2adf0f83d449c5a1eb201cde711c42e6526315af4f12f57f87a5dd8
font_01_sfnt_off00010dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD5 10664 bytes
SHA-256: cdfe37dea463beb5ed0fc099358ffe274875d662958ddec282413cc2096a0d6c
font_02_sfnt_off00012624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12624 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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