Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be18990aa8138b3…

MALICIOUS

PDF

77.4 KB Created: 2021-09-07 13:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1a6411b738af2b28c4b0f829954aa730 SHA-1: 6c9645095d37ae27adcbfdaab59b38af563ec02e SHA-256: 9be18990aa8138b3b8a89e56a475a35c090c6354c6f37b83407f1ef712a1b2ca
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings clearly show a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=high+frequency+words+first+grade+worksheets PDF link annotation
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acdb1f0b99e---zitidiwurasu.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/deccb91556c8aa1f2fb8c2dae487321a/lepaxizaw.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/78625121098.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b5e891e52---zoxube.pdfIn PDF document text
    • https://ancoraeducacion.com/images/68971439446.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a92d43349---witokutebekobebe.pdfIn PDF document text
    • https://noddy.nu/images/file/27186938594.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6334d0327---jonaxedoxapifamujuxifi.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/97689420887.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/56647783237.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/vj50umsrg454m12ldalpko9ht2/45174124234.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/96981114306.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/42705821575.pdfIn PDF document text
    • https://cncunse.com/d/files/14890428314.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f18010932a7---nonuvilunegevezekivifuxon.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/fukiwesexugerepidibino.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/xonunavurilomaniradu.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b600311464d---54780799605.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6e4261dcb6---42098359929.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/nobofatewafenose.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/domidowokiduradin.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///famipidifobabakab.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/vuwerigonuzajesosufotufis.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_off0000c72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72D 11236 bytes
SHA-256: 39427db7fda19f3156633bec7fa7db9107cf301c952efdf779f2e85572954e42
font_01_sfnt_off0000e107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF919 17484 bytes
SHA-256: 42fcbe8edc609e532f2336ee57bf6c1c9490709ab50b5a5239060f5e45017215

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