Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76713a3428b772a…

MALICIOUS

PDF

85.2 KB Created: 2021-09-06 02:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ea5c395bb1714633acd8e62f796df296 SHA-1: 23e5649999863073b6dae19755fb02fe8b10a9cd SHA-256: d76713a3428b772a5a8db8cf1f9417bd8c98123476a7e5716736a4b37202611e
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 ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, specifically leveraging WordPress upload directories, suggesting a tactic to host malicious content or phishing pages. The presence of these links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ac04e8000ee---filowunuferusimetuwetigaf.pdf In PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/radedozinowanosaf.pdfIn PDF document text
    • http://reflita.lt/uploads/files/71732316798.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/76372620902.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/687a751f5a846072da5369f14ad7b3fd/91293718798.pdfIn PDF document text
    • http://ahchala.com/img/file/47559764893.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/ea43289cffe146584e67b823feb33933/3949434211.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/kawezavewerarafiwo.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/0f937e9187daba7cdffb22c412286484/pamojevetivol.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e84d7427950---36429853393.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/8b364b8266db95a3dd7aae2de39e0c69/mibenepubabo.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/banum.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/kejitajegipapada.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/slfmfjk5h5r806dki6dm21ug02/zukabuvozuxurok.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/2757685500.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/3cace069c37b9c83b2d846e6ee2ce67d/niripi.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/64376938232.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/73663489995.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/2354176900.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b320cc6a325---wisezajiboniliximijozo.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/57vove9c2fqttrmkd0dsb9kh3g/vazogoripudujobizawuwiku.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/2d9330145c4a6f48a842533511605454/waxilepumisozujixodev.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/sanivupadi.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210618_275F5AB0085115C6.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/96881463426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=oxford+dictionary+sociology+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_off0000e34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB66 10904 bytes
SHA-256: c75cd5c436daa41e587d7d9452b6c085e60c9133cb4bf4b579e6d71897aa2faf
font_02_sfnt_off00011497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11497 19484 bytes
SHA-256: 97118a29bde409dbc735ab4e4d71f3cfaf294d4dbd4be904bacb9575382b3d2d