Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc0c36aa7f3c6e4…

MALICIOUS

PDF

91.8 KB Created: 2021-07-07 21:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 381306e14db05ac955d7637bb4642540 SHA-1: a8718e2d2a9d6b798e1b4509684a6ac12cc78ee2 SHA-256: 3dc0c36aa7f3c6e46e796c96190f8bebabec72e242cf7c35395ecc3d2e239754
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links suggests an attempt to leverage compromised infrastructure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608dab5c7c1ae---mifizegadubagufatifeboraj.pdf In PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/6d9ec9850b76552989561f06a714fce6/sodotozigiw.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/6711ceed9b1f1e96a486ed697165cfd6/xikogezimedij.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/29950247107.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/dudowusisazo.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa47dbc9256---89032549186.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdc4058abb---zivowokulunikoku.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/17039083483.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f04b0e0edd---52170025655.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608492495a317---20757503874.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/co8c4g7sjgjplh559ta8076inb/42111071594.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086474ed1ee2---84340979174.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/6286141295.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/5ab6c218b7b20f1f72bc0b7e080edc18/zoxata.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f955fe4f63---77468848517.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160908ef0104c1---nisazuzadepupabininudo.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d268e11098a43460318f4fe0e6b3b4d1/32316244348.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/nukomanabipoguda.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869ab135abc---76776294890.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/xisame.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/dumibebateridexetuvifet.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d1a998956---74326989992.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/peduselag.pdfIn PDF document text
    • https://paperland.bg/uploads/file/59548813199.pdfIn PDF document text
    • http://www.knie.nl/content/knie/knie_kunst.asp]2.NaylorIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=measuring+knee+flexion+with+goniometerPDF 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_off000102e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E0 17460 bytes
SHA-256: f88fca4b502b7341a575973d873a1a73fb3ada82049ace0e155c42ae1eef8bb5
font_01_sfnt_off00013054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13054 11036 bytes
SHA-256: 015fea54a6620cf52c64e83338a6a7289bae785ce79b340603f63d40b12d503f
font_02_sfnt_off000149e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1