Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9b1cd8c9b56bdb0…

MALICIOUS

PDF

79.5 KB Created: 2021-09-19 05:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d098dadba05f1ae55d5a530b9db37c7f SHA-1: 5154d7a577a2dcb4b1fc43bac47366e42582b4fa SHA-256: e9b1cd8c9b56bdb07e9f3c1995bae784ac5fbca86279d6e4d8a15ad3fcdba21c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of these links strongly indicates an attempt to lure users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://synerhu.ru/uplcv?utm_term=online+epub+to+pdf+converter+free PDF link annotation
    • https://delphin-restaurant.com/ckfinder/upload/files/15701402193.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/besitadepajo.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/3f51fc48312be3d5e7d2170d1a8e7975/38387735286.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/sofawuxisozavapoge.pdfIn PDF document text
    • https://synersys.fr/contenu/file/93294876719.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/23685915969.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/iaj699ikevmk1q129pinhrhbvj/muperovaxexawejoxarolivup.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146800065d44---zukopurubuduxufatuza.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/juzesezukubitediva.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/bivuto.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/50960386617.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161373e2d264c1---89843181852.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/97400485408.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/565864220.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/gofebekasekojomenuvezeki.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/womufadakizuliwinipinubi.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/92083265618.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/witudusafazulos.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/pulutew.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/63768943105.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_off0000d516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD516 16576 bytes
SHA-256: 064bd360aa4fe8459a769db31b93412fc234cf90870b3cf40b7eae53f042b745
font_01_sfnt_off0001001b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001B 10612 bytes
SHA-256: ea1cf909803c65088ca8a1a7569617112da8ead2fcfbc0d7966bf049de1c32cf
font_02_sfnt_off00011840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11840 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1