Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7861f7e9fe7d92…

MALICIOUS

PDF

77.9 KB Created: 2021-09-05 22:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b9c061721ed40f40f105c45950e1271a SHA-1: f837bd7a70e878616cc6ca8b54201d63a91a9b6d SHA-256: 9c7861f7e9fe7d92138e1bafedf5640bceab329a37ee88732f71923e9f48baa2
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm structure pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=lines+parallel+intersecting+perpendicular+worksheets PDF link annotation
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608567202c380---69448862213.pdfIn PDF document text
    • http://beateromer.com/bilder/file/64714607737.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/6ndbl9j8ggjbvaoirasaqn36j9/vabip.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/33116814331.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/76193612135.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/kewakuzawewo.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/93807894345.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/58520242732.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/34963806152.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f75fcee28f0---kafakitofabuked.pdfIn PDF document text
    • https://webmenuplus.com/images/file/81297194768.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/869f2ea2610d95bacc603c06bb574587/wusulul.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/bc33104ee31418cc2947888fe19381c3/56221399159.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/zevixusoturogi.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ad569af278---4798304605.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/xujajiduvisegaguno.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/mokojinobomonudujutetage.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/44af48feffaf1feee9486677ba954b91/gifomowubiwamititu.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/21058876042.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/4408116928.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b2978b4bd8a---28953105386.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/sqdndaaen5hpan5qcldsc3trkb/neduw.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f501446e2d---benidesowixatamotegusax.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/97432592050.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/sesufalimejureri.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_off0000c8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AC 18332 bytes
SHA-256: 91f4a9944cb49c9e5f687ea40c143142dc643a8565989d666bd5502477843ea8
font_01_sfnt_off0000f7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EF 11028 bytes
SHA-256: 39f1f447e603efa4bc2069ba5f6eadef557b859642e895d7fd2375f61fdd5183
font_02_sfnt_off00011165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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