Malicious PDF — malware analysis report

Static analysis result for SHA-256 12357ddecbbf04ae…

MALICIOUS

PDF

80.4 KB Created: 2021-09-08 08:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 21be62e95cdd26bc87f0522b914127a7 SHA-1: b04ee349e48422bc2fb080a77ec81d6f842e1960 SHA-256: 12357ddecbbf04aebd05741a77e3b99681d7bf0bb867f785532fa95fdb05bf1e
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The ML_NYX_PDF_MALICIOUS heuristic and the ClamAV detection strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://mides.vn/images/ckeditor/files/nosukat.pdf In PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/4315a4e4c3733e46f771cb848925a9e4/pofigaxarizum.pdfIn PDF document text
    • https://cncunse.com/d/files/86276935867.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/44805182338.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/35897996423.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/dosavif.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/rorugozuxegiruvakuxida.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad439597c86---2888894969.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609866c62062e---60081881407.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160986c4e1ae06---tuxopofexenob.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/29067001073.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/dotipofizoselamular.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62b01c925c---tunikikejafapowe.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/kurero.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/1679565613.pdfIn PDF document text
    • http://www.puhito.hu/uploads/xodupikike.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a287268897d---midoxajaleni.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/f935580af85fa75098191f098de5fd54/26574621059.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/xitoletopezapiwururinusi.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/27955238629.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e49e42286f---49720285494.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/gevud.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/131fpbo04ua6l5qbbt8509seg1/61611544755.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaabca46244---17485396025.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/kuvifobuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tarjetas+de+navidad+manualidades+3dPDF 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_off0000d189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99B 18832 bytes
SHA-256: 62dd15f775dbb90102883fcdd61951f7564e13d397102096885c6a0c260a7f29
font_02_sfnt_off00011a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A08 10720 bytes
SHA-256: 2e0d2c7e93cd9bb888ec353c00872de3939bfcd1557a31ac53475ad461cd2e82

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