Malicious PDF — malware analysis report

Static analysis result for SHA-256 889fcf3dabc48c18…

MALICIOUS

PDF

74.7 KB Created: 2021-09-01 13:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 84f060446f9a1f71abab89bc718a6bc6 SHA-1: 51a364e21d1586d9dd95558229f248aeb9791e64 SHA-256: 889fcf3dabc48c184414fab1dad60d6698bf1094b8d4d07f536051f54bbd059c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://synerhu.ru/uplcv?utm_term=cooperation+appraisal+comments PDF link annotation
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b608a001fe---nakalodedeputivosisomulut.pdfIn PDF document text
    • http://www.toptehnik.si/images/xepavuvowakibenara.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/28603899699.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/kosixilarikomapolanafikux.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/aa9537c6418e993828727a998a598976/lufinusinidavalaxojujapiv.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fd65467a1---butujalalefokot.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/22600620210.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098306810f2f---butijesejijamiliwerogular.pdfIn PDF document text
    • http://gdgom.com/upload/file/210710011249338160l3opa77b4yg2.pdfIn PDF document text
    • http://faithartists.com/clients/877397/File/romowu.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/lotoxep.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/8b7133b5bf30d21f253922fd9f7eb709/fefamulolin.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f33fc3e9ad4---fewevenema.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/91823503771.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/32538073483.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/20892124606.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160868815c42dd---25238014267.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/21976322801.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/66d2e780fdcc095c3dbb62a5d54ed9fc/34536717526.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/83462671339.pdfIn PDF document text
    • https://digireg.li/upload/26896947094.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/d2889f62159f603701b31c1401aeabca/pupotafadoteweserevomamex.pdfIn PDF document text
    • 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_off0000c32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32D 16148 bytes
SHA-256: 93c09b47fd7982f218e61f2059afb3b67e0c81d18bd9203318f9f74c9a355f97
font_01_sfnt_off0000ec57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC57 10564 bytes
SHA-256: 28670f332f72210e4e805efc69b8f21ec71419f640599f19c5d61b31a64f6dcc
font_02_sfnt_off00010471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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