Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f12bb5a1199feb…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 11:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 03817b111acb578d8909a5d7f4172a3d SHA-1: da52fa3e91b8dac28c6ef25c8cc2475c2a9dbbac SHA-256: e1f12bb5a1199feb25c499b32eae8cc65a2acd0633be9b9fd7b9f35c20a857bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF acting as a link farm, directing users to compromised websites that host other PDF files. This suggests a phishing or malware distribution campaign, likely initiated via spearphishing.

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.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160db4f4189968---28452735233.pdf In PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/f138a76cc0f01210b21ab628718425fd/8333246455.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/63481832417.pdfIn PDF document text
    • http://cokhisah.com/webroot/img/files/16296646176.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160accb24058f2---dikaj.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/733f1d13b8ebad591a86471c90340d8b/49424469504.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/zopoges.pdfIn PDF document text
    • http://www.asslar.de/downloads/33218067397.pdfIn PDF document text
    • http://farmina.ru/uploads/files/fonufofepofinoduwadomo.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210514105339_1277770413.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/42064836078.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/76203662799.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/61526391267.pdfIn PDF document text
    • http://goref.ru/files/file/buwozigugoxogirikinu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4545d3ae76---31739770799.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/io57p92lvp38ponbq03l0r9dr1/99056023908.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/zomedix.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/tkkoppdil041cvp071l681gtge/soxerutidekadug.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/79958576880.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/37083023379.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/c3ffa4165e811cc66e942abf9cdebdd8/tanow.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/e4911ced17a793b45bbac468244073b5/14421648413.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/029ddbe4f3b02bd64d4b762401862927/49859731517.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/jodavukavezerokuxedubib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=trademark+infringement+and+passing+off+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_off0000dc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC38 18176 bytes
SHA-256: 93e73575b45454f50f423b4de7296d074e95c1d72858349468817af127572535
font_01_sfnt_off00010bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D8 10848 bytes
SHA-256: 180f07a7f5b6db7eebb69f07cc8c53c55858f34112a77c6421fa2de1dc93af76

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