Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb60ab5fbc62e52d…

MALICIOUS

PDF

86.7 KB Created: 2021-06-27 03:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ad331ec702b7f37f8a7252247a432ab9 SHA-1: 09e03306d92a63e5b3574bedd134fd9e53e2de3b SHA-256: cb60ab5fbc62e52dd86f5e71662e21be8d451c64d372e5cc7f364f4aa0e4b664
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous embedded URLs pointing to compromised websites, likely intended to lure users into phishing scams or to download further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to evade detection.

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://archism.ru/uplcv?utm_term=the+complete+idiot%27s+guide+to+precalculus PDF link annotation
    • https://die-elke.de/cms/elke_page_files/file/78807070697.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3979ca185---34731799633.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/664291674.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c338dbd1aa4---4325279284.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/97968929455.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/tmd7pfgrh6irc72luu0kb4sl5m/50190933891.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/makagudefobaxelimaviv.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/e682b578d1b587f9566204e2d7642ad3/nurok.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/def7f764fc0f26b90b9efff459b54014/4868255813.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c9487cfc4---30848125907.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/rerobubujav.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/a40be8830421617601ba876fa41ccc44/tavoxawuzafu.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/salumajiwolomewanugagiw.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/792fa827c6150e0eaa8dd71c4c9e4db4/3575066159.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b56bee5aba---gudubopezogadeb.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/7si1dj3iu2a869j0tuohmhv430/lajugosupuvebivowanijal.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/f797596efc10630e5f16803794591c76/76902815224.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/dc11965f87c601a678f089907f50719f/90071228974.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/81988676249.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/lurik.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a0981c787---dakujomisabutufo.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/vuwiv.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/50608a2e4016be2f4229fd2d13748aed/34301060124.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_off0000ee28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE28 10952 bytes
SHA-256: ae2ab03a9c9c504fd8c383eaa0e05ef7536a4e53fde47345e514f5ca5c669b03
font_01_sfnt_off00010762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F74 16996 bytes
SHA-256: 394a9afa1d54be710935c17c424d4a1560b117c2102fea652e832ba937689324

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