Malicious PDF — malware analysis report

Static analysis result for SHA-256 631e5aecfd075b48…

MALICIOUS

PDF

86.5 KB Created: 2021-07-21 22:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: acf1b2fd117b003a01270aacab7ab44f SHA-1: dca7f5d3a39a30dae7f8be38211066f8eae91564 SHA-256: 631e5aecfd075b48c8c16e6ff8d9f0e14771043fc842f9bed8a2aff29bb65331
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external PDF files hosted on compromised websites or disposable domains. The primary goal appears to be redirecting users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://aias.pnu.ac.th/ckfinder/userfiles/files/gasonopasosenisamesozop.pdf In PDF document text
    • http://itkaufmann.com/images/fckimages/file/sejozinexi.pdfIn PDF document text
    • https://artbynela.com/uploads/file/76340683410.pdfIn PDF document text
    • http://flambotour.it/themes/userfiles//files/tojaze.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/8847100527.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/bafbd28e3ab3748cd292d07042bfa6c0/51888543340.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/3cf170b1a114f432a9a5bdb20a8a48b3/pagunisekanavew.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/b08e35f0cfea350cca46e5047e75330a/pizodusixuvodevowatef.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f0de231da---ralulilalelonoru.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/vevedajur.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/3113419e6a1bb29bd1630631fdb029b6/dosamo.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/guzukagexeselojorerafekuw.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/1sumn2pshcurfc8ev61amrufjm/kavavatuwufakuxopoza.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7ac54b73---bebegibapavisowot.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/21826820536.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/23308784672.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/fukewotujaraz.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948f4e1cf87---wekinonewine.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/94449197991.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/becc48ae882dae1745e12fbca06624e1/65492931409.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16094b62accc16---bizatatesimaxexabijabi.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/4dp7kapg048ff9ggf917fop1i0/37152624417.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/56634871503.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=234+w+bethel+rd+coppell+txPDF 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_off0000e946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE946 10684 bytes
SHA-256: 19570868eacaaf9250ca35ee079144061ed3892501c4cfebaa782d0055fc1c53
font_01_sfnt_off000101d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D0 18584 bytes
SHA-256: ea05f063f689c87f069883305d6a76a83e0e98d0d80aa80ffde5feaf5671acb6
font_02_sfnt_off00013283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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