Malicious PDF — malware analysis report

Static analysis result for SHA-256 7408ebf2f2b4adc0…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 06:19:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bbd142fe0bba56a446f15e618ea5ae42 SHA-1: 255ee071ab829291ee16823452b1780957dfefd2 SHA-256: 7408ebf2f2b4adc05ea0506cb1bdf9fa647a06ca0454fe1457d825367fbacbbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a phishing lure or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://oniceh.ru/uplcv?utm_term=descargar+juegos+swf+para+android PDF link annotation
    • http://modern-pro.ru/files/file/99425562929.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/waxajajupidixovisipu.pdfIn PDF document text
    • http://beijingteye.com/upload/files/48487703388.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/motozejasokuz.pdfIn PDF document text
    • http://remobudostol.pl/pliki/62948253934.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/kokibokurituzejeko.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/10708112579.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/78009713846.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/12235088027.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/85080800218.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/34384494434.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b72b8c52c2---bifopujazuwu.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/besotefuvuruliwizekelun.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/88014661310.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e047223528---batipulor.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/125bc8c788477202d6dde4819339f140/letelu.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/dezesiremegavatokoz.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/94319415262.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/mimurojiragukuluk.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/zapatenemuporofalopesim.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/wefuzuvajerujobalefamez.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/16918559748.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/48506946164.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/nejet.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/euf7lm241kqm1p7e6gdd6e47l2/75779607854.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_off0000d9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EB 10968 bytes
SHA-256: a4addffb9f09940ac043252b88e90577669a6b04935ed502bf5af912d24b0df2
font_01_sfnt_off0000f358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 18680 bytes
SHA-256: 23450b197e9d0b44e6d0d3f43072465c6d189ed0fb50ac383a0e36b5d24556b3
font_02_sfnt_off0001228e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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