Malicious PDF — malware analysis report

Static analysis result for SHA-256 237d176cf0a5488a…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 06:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f12df6dd9fb0260670f458e3977a3cb6 SHA-1: fb7b38c45d107300af067fad9cb9e494c797ff70 SHA-256: 237d176cf0a5488a79ba72b1929c240214568c8033f80751e88c2763e7178f30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing campaigns that often leverage embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://infrive.ru/uplcv?utm_term=sister+housewarming+wishes PDF link annotation
    • http://ngnjl.com/userfiles/files/24055496405.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/zumoguzawuvusojezemus.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/186854256a7df3e411dc4673032867de/saruzuposej.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/7805313099.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/lamivimuge.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/gixawevuxujokeweni.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/88518756043.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/89641141218.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/5anghmd1d2kcs6hqpj8lf40v2n/16571092883.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/70422815070.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/e2b02f38db2694eda508d7a2579a8aa3/vuvazawoxofakowej.pdfIn PDF document text
    • http://la-klamm.org/userfiles/file/19774448042.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3919697e7e605a720123a3790466b2ac/60584780494.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/85035628214.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ftldv4fj11gl085hsnn577eu9o/15311881794.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/f10e1df6314d70005d4c8d7109f2b528/14780903152.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/10693976737.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/401797971.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/nisejo.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/1j3hqq39g1njbqjhul0qunv906/9572616820.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/e5fb088cadc6d23f738ffc949eb48883/waxuvuma.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/97318dcdf84e8d1ed41d18b1e9775798/woxuzekusinasetegiwuvuk.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/89416277277.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bf30aaf42---regodominarorujiporop.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f13aa8d4903---xuvobekoladeso.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_off0000df23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF23 17228 bytes
SHA-256: f54531157c8b82875ac41908f5331104ebe152bdb850071b9e155a033879df30
font_01_sfnt_off00010b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12379 10772 bytes
SHA-256: cf465e9d34b905dcfc8923e35e2ab4d05d782ed36df0640e74074274259f0cf5

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