Malicious PDF — malware analysis report

Static analysis result for SHA-256 7396b767cae426f1…

MALICIOUS

PDF

80.3 KB Created: 2021-09-21 05:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 9d948aa098ed814fa0368aefa6e7196a SHA-1: 305745d95173995e6b64a48ceffbffac3fc2d78e SHA-256: 7396b767cae426f1616ff91022d5688e5919ff444fdb032636d8d9634694e0e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. The presence of embedded URIs and the nature of the link farm suggest an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://wastran.ru/uplcv?utm_term=how+to+enter+recovery+mode+without+home+button+android PDF link annotation
    • https://minhkygroup.com/luutru/files/wiwevuvufawezufejuje.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147508983435---gaxifotune.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/pajolamobuxubi.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/77423763317.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/9212667124.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/e91f70cb4b2eb2e948d06fc3724867b6/70742636408.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/35984431567.pdfIn PDF document text
    • http://photo-ostrov.com/ckfinder/userfiles/files/84317929855.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/39870040893.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/56671358934.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/62013784211.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16313896721206647738.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb970b38dc---ligipiforuvisifipet.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/tudejivanuw.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/wemobubitemogup.pdfIn PDF document text
    • https://navliecky.net/userfiles/file/rorapo.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/34973283032.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/81319504861.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/99219088957.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/24172798508.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/97134413504.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161456afe5a38e---rubavidejutunopigegubako.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/numorawuparamifevopig.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/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_off0000d6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D0 17596 bytes
SHA-256: 6fd94b72c3a7d78c9355aca87e6b20d7d28c92f5f4695f84bd94a9e1b0e8d3f6
font_01_sfnt_off00010409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10409 10916 bytes
SHA-256: 0b4596fa2a58d3f9fe2e325d6a2e6f0a992a0602835211cba743bd03dc9dd6d9
font_02_sfnt_off00011d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1