Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e506ab45663b26…

MALICIOUS

PDF

70.9 KB Created: 2021-09-01 02:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d7bb11fd95701c50e3b2d4f4cdb9f317 SHA-1: eb9d40aa416fbe9eb256d65e51d17718630a4628 SHA-256: 13e506ab45663b26af61444308a4acb753771591dcf64b12ceab626840d25f07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to compromised WordPress uploads and other disposable hosting, functioning as a link farm. The primary purpose appears to be redirecting users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://laborke.ru/uplcv?utm_term=slope+of+the+line+passing+through+the+points PDF link annotation
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/j4n9iine31dm3heh25urpb922e/puvoxopixixezitamape.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/96665262061.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/44279319247.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/diwamalutezebumim.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/63538044784.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160896186813f7---78443855088.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/52681810957.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daba18deaa3---zonegalifezalizitoloxa.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/dusemokadefanifudomatox.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/wesen.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/jawazusofutokamow.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/kizeperunosepebe.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/it7ju6i3kvu1083s41iu2gcst1/zamagunuwoxisimugokizum.pdfIn PDF document text
    • https://cargobull.cz/res/file/2659773447.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd6c8178cc---kijexito.pdfIn PDF document text
    • http://vhktn.at/images/content/files/zifosilikewibalitu.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210812170147108.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/34940640994.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f8400e8c7---48423928310.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/c64d50ebc5526d51406461ed42de87d4/kevojewozutosuxoxodezule.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/63307258958.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a905836e4---puworogoxorigiraxipalux.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_off0000b6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A8 14992 bytes
SHA-256: adbc7b5935f4b5f42591f2572a28273e8e3b9fb6ac755d677a6856a6bd0a2514
font_01_sfnt_off0000dc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 10812 bytes
SHA-256: 731c2c32137bc5e6b2849bf3b9432931e22de494ea3d755e584da11f8448ee0f
font_02_sfnt_off0000f56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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