Malicious PDF — malware analysis report

Static analysis result for SHA-256 d40077145c0c7641…

MALICIOUS

PDF

77.4 KB Created: 2021-08-18 15:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ede32435bc56bfe2f8e86fc919dc39be SHA-1: e76add9d9a8b8f36412388b692c127193e5e1def SHA-256: d40077145c0c764103e1a86a7f46ebae408b287dc6327a3678a12ca6054ef741
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to compromised websites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document's structure and numerous external links align with techniques used to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=blank+spelling+test+paper PDF link annotation
    • http://lakesnwoodskerala.com/uploads/file/rovimekasiturapo.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/90442000012.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88afeb231f---35677372405.pdfIn PDF document text
    • http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/bonowigajidaj.pdfIn PDF document text
    • https://rinducm1.com/contents//files/67953368081.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/4fb845fd1ec65bc5037b4a715682c197/givowekisepofosixirob.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/91c0ffb1076323f33e27844d1393901e/7537609213.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee1d70ced1---45366414796.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/laluxifipubuniwaselebugap.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43d7a4221e---popoli.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/82175802188.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/95448717112.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6523352391---85896806010.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/tomixox.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/20837097378.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/kusegadupazekoxo.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/64284583225.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/bojinesosuj.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/f58acb196ae39491aabbab3dbeceeef3/94950370694.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b9340a4e7---70254263515.pdfIn PDF document text
    • https://aneri12.cz/res/file/89046351188.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/63880542410.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/0978b9015cf471278ca535a9c8bcd1b0/89324330220.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7bd3b3a8eb3cc07c0daa88d1d9d72c38/nefutatoze.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_off0000cc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2F 16008 bytes
SHA-256: be402b7dec53ee9ae89b524d901e169689e97b15e8d4b7b22a6c9cb1c9b549f4
font_01_sfnt_off0000f57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D93 10452 bytes
SHA-256: 5bf368291d520dde0d4a06c766c2744eb24e7da29e9e641f7bccc5d1820339ae

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