Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39bf520fe889d0a…

MALICIOUS

PDF

79.8 KB Created: 2021-08-22 02:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5f2bb21fc247a9cd949eb788277c14b4 SHA-1: 685c5be196cf9ab40b3a312813a7e3953e487e1b SHA-256: a39bf520fe889d0a5014023d17224ba331a658bbd541529a22a59c01c725864e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits vulnerabilities or serves as a phishing lure. The document functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised or disposable domains. These links are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://garglob.ru/uplcv?utm_term=humpty+sharma+ki+dulhania+movie+download+dailymotion PDF link annotation
    • https://asiahijau.com/contents//files/kifazuzuwipot.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210720194318.pdfIn PDF document text
    • https://avenue102.com/uploads/file/pawexulubokobipazarenirol.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfded9897e---58655473448.pdfIn PDF document text
    • http://heureka-cz.eu/files/40915941060.pdfIn PDF document text
    • https://phuquiland.com/upload/files/96023477832.pdfIn PDF document text
    • https://ocw.tw/uploads/files/34838322111.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/f9p85i5r5k5ia5r6cl8vgrjatn/88643821867.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/tujrhaqe3aoi3vqlnj9dqvrmiu/29590751715.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/konis.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/xafazokizujutebexozudika.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/6f0373d1c15724dab8d468e7b54b5fdc/93463073000.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/xedigewujerumivutaniba.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/35afafe31be063700586580406298cc5/74288199647.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/59513522680.pdfIn PDF document text
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/53743031398.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/fatigixabomiziparalis.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160df7a3822293---wepewevosilulijupeleta.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/42529535849.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/fiwoluxogosixefi.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/17246154230.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/belovetejewigokoruvakifi.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/64d07dd8191783fcb6eb3e1431da5eab/volifufenuwes.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/tbkj462hlj06o2o3qdcaqa3lg2/51080059363.pdfIn PDF document text
    • http://lucann.com/Upload/file/jodojixirowivanapexajopo.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_off0000ce06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE06 18648 bytes
SHA-256: e08fef319e3ada44de705f4700504f13fa8ac44755c6b845f61b75713c716017
font_01_sfnt_off0000fd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD53 11104 bytes
SHA-256: 82c4cf498b5ff6cdde28d4a19905f413d53c50d5daa43d1610307f502700b105
font_02_sfnt_off0001170d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1