Malicious PDF — malware analysis report

Static analysis result for SHA-256 615298dd98560cea…

MALICIOUS

PDF

76.6 KB Created: 2021-09-27 02:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3d86b982012090167825c7d5680a73a6 SHA-1: 906abf619e4ca93b4e156071a453faa6367fb823 SHA-256: 615298dd98560cea535d9a90932fd12c49dd844a0294295cdb349707b921c889
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://pistant.ru/uplcv?utm_term=fonts+emoji+keyboard+fonts PDF link annotation
    • https://villatoscana-pi.it/userfiles/file/30424115668.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/gonog.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/58475037336.pdfIn PDF document text
    • http://surestegc.org/documentos/file/32424530500.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/87153133017.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/75044464312.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/gusoxubare.pdfIn PDF document text
    • https://vendax.ro/files/file/dovififug.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/45681312785.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/dugalepido.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/jotidavajug.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/85913394869.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134513f9a822---12549672310.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/95006527381.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/90642757590.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/62546736771.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/31748090217.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/dedelefidemebasanakosonu.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614553c9226a2---kaxizomamoxeb.pdfIn PDF document text
    • https://mkontakt.com/dat/file/segipotamomuret.pdfIn PDF document text
    • http://turksebruiloften.nl/userfiles/file/nifenimidebesojufoj.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/gaxanedodeviteluwajegig.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2a701532d---batuvebezivanozer.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_off0000bf86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF86 19924 bytes
SHA-256: 870bea2a1074d5290623895958b2c5ed8cd00c7d3fdffe9ffaaf52f370f4b36e
font_01_sfnt_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 10924 bytes
SHA-256: dab34c594ffc5055ff6345bce8b4a09750a5410db424130caaa14f71553a2ea5
font_02_sfnt_off00010ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1