Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3668be9bd66b43b…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 12:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3fae372b84890e32075a5ca0cb3d98e SHA-1: 509dd6b64373522e5d7fc895f0302542355a4be8 SHA-256: a3668be9bd66b43bc75702ab5502104d7da97ac7f2974e0a7310334569ade135
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm or phishing lure. The presence of external URI heuristics and link farm indicators points towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=2016+bmw+x3+owners+manual+pdf PDF link annotation
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607243df672f8---11471133186.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d4e059425---nutedarirodimu.pdfIn PDF document text
    • http://drironcat.com/images/file/winepofiwevibimo.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/pupegosipoxonajoki.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/tomude.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/69737907098.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/mah4ap0vvgdpa8c5foqu4lgks3/budelewiruvexoriwosuj.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/65196019754.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1d2ea129e---9931662769.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/880e88a16f4e29b7dcdfa1bc51079555/26263657465.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/36820383093.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/33460584119.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ac8pnbrn561clt91h6nebuosu6/56131146381.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16103bc9da3bdd---gagimutatonage.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/vemozejopup.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/90464893249.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/91787486049.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/vexupu.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/86620307384.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/sirakema.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085ba3e89383---jugikazoxesonudi.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/96951172838.pdfIn PDF document text
    • https://orrizon.ru/images/file/bifozujamodew.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_off0000da2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2A 11436 bytes
SHA-256: 9127de4db1d4fee53d1e4fd27da9d3880b9a39cfdb12f14dc6d65bf63f213bc5
font_01_sfnt_off0000f518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF518 18948 bytes
SHA-256: 01509e6eefeea3bc3a1228387ccbbaad54d684df0e3d62632693ba858d06f89a
font_02_sfnt_off00012668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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