Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac6ef19341cd8f4…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 17:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0f989090d5335043f04fc01b0f970936 SHA-1: 1a86d0216912c2b3c4ec7cb5c19488d1a3c33f08 SHA-256: 8ac6ef19341cd8f4c98e8537603fac9a209b273f61f4a5a360022c110095232b
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains. The presence of a 'download button' lure suggests a phishing or scam attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://rpaxis.net/userfiles/file/ruvajumojokerekipuki.pdf In PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/jijot.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/49891722899.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/penotutadinujirofiniv.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/d927d75b08ae05ad35d570b3534f477f/70762669074.pdfIn PDF document text
    • http://methese.com/upload/files/34775241636.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ab8704c18---sileweda.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/qtbtqtjc0sg5rjdpf56ib0f4bv/gefitivifugivuvifapaledux.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/laliviwesejelulupo.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/melifeposeg.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/65446866113.pdfIn PDF document text
    • http://bjjiffy.com/upload/vunulesuwumaserafuvug.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/mulexigutobofagigivudowol.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/dujogejolebid.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/86695287739.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/75213150879.pdfIn PDF document text
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/ruwovuvaletexa.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/73441388453.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/xufekigogunoramoberojam.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/tejosur.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/87433074230.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/77095031992.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cinderella+readers+theater+pdfPDF 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_off0000de67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE67 17324 bytes
SHA-256: e4fc3791ca10475f6da50acc010c65aba9cfbfa4db49c982e2dc0fb094d34021
font_01_sfnt_off00010b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 10504 bytes
SHA-256: 26f7442e52fa54b449eb242eb5d592f27ac84ce7d802dcdcc1de89cebca4eaa1
font_02_sfnt_off0001230c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1230C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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