Malicious PDF — malware analysis report

Static analysis result for SHA-256 d07da95fbfab63d3…

MALICIOUS

PDF

89.6 KB Created: 2021-07-05 08:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 38b49338d085c1c75568347521cb1c15 SHA-1: 273a90fffdf123d5df400ea90013c59ba7e15adf SHA-256: d07da95fbfab63d3b1e84889073ac4946143b4cef1a3fdbf40ce9be116915c70
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple distinct hosts, many of which are compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The embedded URLs and the nature of the link farm suggest a phishing or redirection attack, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b279c590b11---88839435141.pdf In PDF document text
    • https://xo-sound.ru/userfiles/file/vakasitoxif.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/649ead09fbfcbba5720e3bca7f0b1d1c/72915795159.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d382ea05ce7cf7524dbf4fbd74f47753/78828323764.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0debd5240288f689d0ddcd8e725ce9e7/fiporewo.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/161c0a10150b9a8f20b66a7c87e6f64e/57347920697.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/35d76413f312e5191deaf76150c5fce2/84946520449.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082d9ee8b0e0---diranafewegeb.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e0f3aa679---34472051344.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/730c7ddebe3845c8c605e1e735f1ce52/75379071453.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021062219313473499.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160887b7eaf80b---1630263969.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38f1b575df---5669177310.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/2cdk677rdc5650mdrk6eim7mfk/puwebenidupizomefugabevej.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/cdadf506460f4884b5beadb9cea383e2/21434381151.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ugokepi.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/452cc71a0b9b7b94583a5f5f797062a5/13994301959.pdfIn PDF document text
    • https://melz-feu.ru/upload/rufajijejo.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/nezodesoravudevuge.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a173314e6e---letupigesomaf.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c512e28a1ad---36881154414.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/39811536025.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/tubetosuboma.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/werorelarineposawezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=what+is+the+energy+required+to+go+from+a+solid+to+a+liquid+calledPDF 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_off0000f464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 18780 bytes
SHA-256: 6c70be6de5b0a526732816769f16fde3bcdf28ad11791fc520bb15f68f768643
font_01_sfnt_off00012672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12672 11276 bytes
SHA-256: 396912268f455612d03a2de19ce9ea7a5facd478dd60df78efe8150902e06332
font_02_sfnt_off00014046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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