Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2bd43a579b307d6…

MALICIOUS

PDF

78.9 KB Created: 2021-09-10 11:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb9a363a4709b37962e2067f2e6358fe SHA-1: cbcea5cfdee062001f26b106fc4d12bcb20561cf SHA-256: c2bd43a579b307d6896d8c58d6a63e9acb3b2de7bd60e262a6a5263653e9d94b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or spam campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://crysiq.ru/uplcv?utm_term=doctrine+and+covenants+commentary+pdf PDF link annotation
    • http://ahzycw.com/upload_fck/file/2021-9-7/20210907054936873075.pdfIn PDF document text
    • https://tckontrola.hr/files/5032637961.pdfIn PDF document text
    • http://wirheiraten.de/images/file/15673102792.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///71304864477.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/64207020783.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/67163832651.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/ponujukuwugu.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136c0d033fb2---48862367529.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/zixewa.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/fewurozomega.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/62074301994.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/2523960c91f517de7c9defc7ca4ba938/maxusazejukudid.pdfIn PDF document text
    • https://bor-diing.com/upload/files/nekezefubofudizawudab.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/guwupubidema.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/45610323988.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/dabunolunuroxuxepisivipa.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/68886165215.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/fbb022bf48745f75c7949974a7db23b7/waradojekat.pdfIn PDF document text
    • http://orthopediedelft.eu/files/23624502249.pdfIn PDF document text
    • https://thebillionbottom.com/business_school/uploads/file/74661138872.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/dawijesuris.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/setozazuvijipore.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/58518416592.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/ratoza.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/94896176727.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/92177074678.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_off0000cd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e57c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57C 17984 bytes
SHA-256: fd92abf607cd52e12ae663e1b33a8f5e6eb863a4b3f012cece12e7b4e3ca5784
font_02_sfnt_off00011463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11463 10916 bytes
SHA-256: 6678806eb0e25d7c47ee451ed89d028c61bce9d3e9f6184388764ebf3b71b9e6

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