Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8f00beb1dc33b1…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 09:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef32606b2c64227c3a0ff26ec75dc00d SHA-1: 0b05cb7627a9fc2272c2a34186130e82f7a2db46 SHA-256: 0f8f00beb1dc33b164056aaa3be1de8e18e6e1dc9f8c3be941b92ffe80d1562b
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The 'SE_CLICKFIX' heuristic indicates a social engineering attack designed to trick the user into executing a command, likely to download and execute a secondary payload. The presence of numerous links to potentially compromised WordPress upload directories and disposable hosting further supports a malicious intent, possibly related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://kovofilm.cz/userfiles/file/norap.pdf In PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/busipevirutoba.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/kajakitunemugaxiwali.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/48619199784.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/mugumi.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/37278941104.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/bebesejaditufejetapevil.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/59846142475.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613436fe00281---88191809211.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/10724123685.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453047d77c7---70624918596.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16134020bdff19---sinezoroloxapadujum.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/77988075532.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/34510809038.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/nufugevonew.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/30659729535.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/30370694699.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109011400027600.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16130add5002c4---56067251675.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109011653586610.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/nabamelemaloji.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/minokiguviladixari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+take+snapshot+on+android+phonesPDF 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_off0000e1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FB 17340 bytes
SHA-256: 6319fbe47b51ba072ecc547517d4b301822bbbb26946555cc5cf38d2a5f8bd82
font_02_sfnt_off00012733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12733 10612 bytes
SHA-256: b6043c9728c35068ba601f967ffea55015be24adaa800089cdd718297452cdf3

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