Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d40031b370cdc64…

MALICIOUS

PDF

82.0 KB Created: 2021-09-08 09:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8b3e315232d9871901bff5c04f8b7a40 SHA-1: 45182c80665561795ede88d066756980ff905e94 SHA-256: 1d40031b370cdc64caa01bd3609159dfb3941844e6791ea41290c10e2df95ac7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://www.vnv.nu/admin/library/ckfinder/userfiles/files/xamevipab.pdf In PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/4e14700592b278115d106389903695b7/lonodogixipasaris.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/8adcbc1ac820c1255dc70bcf1f89360b/92774458047.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/55459883752.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/9e8b7d67c719f658d7e80173a6162aef/vumosaweniga.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/zineridisajoxironagubup.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf06ee8ae7---zalebezolenupi.pdfIn PDF document text
    • https://hse.tw/upload/file/38107474174.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/gabojim.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/lajeparo.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/71411189939.pdfIn PDF document text
    • http://fitviewer.biz/files/file/pasaletewiwim.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/69430665228.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/vuxetofo.pdfIn PDF document text
    • https://naves.cz/res/file/xenokozazat.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be87d79e597---86098397952.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/81134639909.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48275d4d17---74379707353.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/gukuwivi.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/21113782907.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/loxus.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/641eed28c606e637bb7e0217625050df/5798846521.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5944273ec---10622244657.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/vgg5k15nadhgb3dgv9a4o0j3h0/modemidama.pdfIn PDF document text
    • http://patokapugsnkisses.com/clients/61143/File/gulub.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/qlo90sslig6t6tegn48lm8q8b4/79511167542.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/85211724847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=database+queries+interview+questions+and+answers+pdfPDF 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_off0000dc1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1F 17256 bytes
SHA-256: 5d49e3a249472a443400b0253951e538a9e801d5ba8efecaea8c835cd60e98c9
font_01_sfnt_off000108bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BB 10984 bytes
SHA-256: 0cb1388e6cf5fc370cf8fbce65f280ab171a4ce4b671e04046076c04d5362e72
font_02_sfnt_off00012208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12208 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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