Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0b9f9f721af1fd3…

MALICIOUS

PDF

73.2 KB Created: 2021-09-15 21:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1f1334d1e43e0b184bb5b32ee8be8edf SHA-1: 010ebfffaf2593eb6d5a606e2982365113b5958f SHA-256: b0b9f9f721af1fd32bdd525d9a9e5e7c7c5284a910927737d9253255fbb4b418
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://dentalweek.eu/userfiles/files/nonidejepuxulorilape.pdf In PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133af18f081d---85722677766.pdfIn PDF document text
    • https://incense888.com/uploads/files/202109022233184118.pdfIn PDF document text
    • http://kechengchem.com/upload/files/tutobujawof.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/598587e0e01cc753585d10910b9719c1/8715308014.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/sulojiwisugujejawera.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/zurabuvadoxafegalar.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/biwudugeriregade.pdfIn PDF document text
    • http://vning.net/filespath/files/20210903191452.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/674274366.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/35675861295.pdfIn PDF document text
    • http://cudicio.it/images/file/vivumeran.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/50308820604.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/4245199ba76700e996752dc2b6c94b39/59711990529.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/gebesudekufabuzegejeve.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/juzebimukidutabosovozi.pdfIn PDF document text
    • http://1careglobal.com/upload/files/19523806422.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/42712283950.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/80618680131.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/vojenawi.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/38689195874.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/75608049782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=ben+10+xenodrome+plus+game+downloadPDF 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_off0000bac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC1 16668 bytes
SHA-256: ea7f60403ebf611d088384b805311b733c4429851b6faa8e3d02cc3d38e734f0
font_01_sfnt_off0000e5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AE 11060 bytes
SHA-256: 44980dd60424065a35722e9c271855a5b0c544b06734dbe33c59938bf2fddd2c
font_02_sfnt_off0000ff53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1