Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9c82c6aa869b4b…

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 17:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fd5adcb016d2abc09f86d38302526dc0 SHA-1: 81c7b8ac420e17eddc8589188a17095e98d2912c SHA-256: 9c9c82c6aa869b4b0eefba67eec7d1fc4aac3d8b2f08e49e714d26535cb17b0a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The embedded URLs and PDF link farm heuristics suggest the primary goal is to redirect users to potentially compromised or malicious websites. The presence of 'utm_term' in one URL further supports a phishing or malicious redirection intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://huntic.ru/uplcv?utm_term=tom+2+game+hack PDF link annotation
    • http://dxczx.com/ckfinder/userfiles/files/20210909_050109.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/wezigafukore.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/bipuzejewakedij.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/50514185949.pdfIn PDF document text
    • http://abpaluso.com/upload/file/kapevujorinutuvanolo.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/37547320207.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/gopodawubog.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16142b303ee56a---46475972007.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/78481911373.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/78330129744.pdfIn PDF document text
    • https://viettrungson.com/media/Files/90697876349.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/renuluxirezopapebejak.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/tatozu.pdfIn PDF document text
    • http://boki.hu/editor_up/13299828469.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/80234446626.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/tadiwukivefo.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/4f1276eb47554fb36e314eb2a90defa9/78915753272.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a176b69fd---xotitufaxukimawiv.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142f96bd03a7---najij.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/53092577604.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/62505712324.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/76499115691.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/57179333426.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/44059818904.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_off0000b050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB050 17060 bytes
SHA-256: 3b401bee4c7a096c987e9c0821725a8361034ab6254815c2485223502b9a7415
font_01_sfnt_off0000db94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 10244 bytes
SHA-256: 785cc7c52d9741099a0a4c1894801d633849b130e7f2f2f9e3be9dffd2e8ebf4