Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6256a03a1b1165d…

MALICIOUS

PDF

74.8 KB Created: 2021-09-02 01:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5ba68ae2ccc6cb732865b0fac400652a SHA-1: 38dcbd06e157275df378a6bff03bfe31357debcf SHA-256: e6256a03a1b1165d7d94707f8b4f3560ecf09e2bf05e3b2a90099d828fcd7a33
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised or disposable hosting. These links likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://biotledlight.com/userfiles/file///73012882516.pdf In PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794afc1d902---5054617932.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/fugotijizifuwaru.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/776bccbea48297ec8797d5d7047d429f/35491693557.pdfIn PDF document text
    • https://sanidom.pl/img/file/tepukipirazexukiwil.pdfIn PDF document text
    • https://digireg.si/upload/1101438835.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/qoqre3bagmk2dhuhe33849lqp7/21029757319.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/1491146411611f2b00eaf2e.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/neximawibixivebikul.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/rofokubaxumonosutumo.pdfIn PDF document text
    • https://x-software.cz/data/file/15798180891.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/43178640884.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/gozepevuvataruret.pdfIn PDF document text
    • http://effektfilm.de/files/file/85340330520.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/3313375191.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/s7qj01ipds73ct9a9g1db1v8n7/99154215695.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/41034216904.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/10636696115.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/fufitizuganimajelirixe.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/7ab0bcfdd1c8bf04ac4e7ecdd99a1c02/suvadomu.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210813211151.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60a9898a1---78440660612.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/fatisapakex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=open+corrupted+pdf+filesPDF 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_off0000c4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A7 10576 bytes
SHA-256: b209363fbda061a97189d02804bfc2a82dd94f83b4c4ab3bc7eb91b59cb2e00f
font_01_sfnt_off0000dced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 15548 bytes
SHA-256: 691a2e556223fed5e945c547f851e2afbc8723a01690a63d475d8adc20efdb05