Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98464f1fae3d9d9…

MALICIOUS

PDF

77.5 KB Created: 2021-09-24 04:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1706e2a0e754ef79244e1026fe05e46c SHA-1: 32ef7b3472769288f0fda37053ea940869b18d04 SHA-256: b98464f1fae3d9d903a21083c9b4448fe427f958bf86b2aac45a59a3e462382d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, designed to redirect users to download sites. One such URL, https://huntic.ru/uplcv?utm_term=download+wings+of+steel+mod+apk, suggests a lure related to game modifications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=download+wings+of+steel+mod+apk PDF link annotation
    • http://www.atsamuihaus.com/image/upload/File/88854727032.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/vuxisuwuse.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/95687901199.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109140433292149.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613602868b09d---moripupomitimevekilurer.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/rozurela.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/jumolepopolunofurolim.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/kamiv.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/3550d20c3259e6d6deb924ed25c44b51/28395223316.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161472840f20bb---65460791063.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/dukavurugiwevexuvamopape.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/17150800968.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/ruvek.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/mobovelipeso.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/18360651815.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/jopegilumolagidurosixejew.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/20559908751.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/mvnb74dq6a9mj1r2t6uoob3a4b/53918995275.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/29561760091.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/zojiwemerenuve.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eed8116c14---sekelekoxowelagitosofetun.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/judafoxomedopasi.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/6om04pscqftqep1c7m99r8e5n3/51009323007.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/58219594992.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_off0000c1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DD 20504 bytes
SHA-256: 5f858ba7b6fccd437c20e072f9fc753a686ebf9da6d7bb7d42e87a17bd1589c0
font_01_sfnt_off0000f799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF799 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB0 10920 bytes
SHA-256: 255d1dc576656da8aa3cf2fcf7ce0be24dc56e1aff373792437ee0f5e99e6d00