Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b126fbbf14d3439…

MALICIOUS

PDF

78.1 KB Created: 2021-09-03 22:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3a1a8f673d9ca1164a68fd66b9ed5ada SHA-1: 93bcfe1d52ece9737b37c5cc351004f5d604116e SHA-256: 0b126fbbf14d3439850e6d692cdb0f511df07e1d98cdab919a801395408a7363
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing content but containing numerous embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nicenpos.com/userData/board/file/53535179231.pdf In PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160735da389a03---zidetikamoseneji.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/73108237408.pdfIn PDF document text
    • https://landbar.com/upload/files/pemagiwabegozopexo.pdfIn PDF document text
    • http://mariancozma.com/_user/file/91047009235.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/27860696384.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/78381918468.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/7cgvq2of3ma66g66qm0u4tgbnp/wanonave.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/furotiviximotirajumo.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/97489429927.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/fisekuvitarawesovemumil.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/xufepugolovos.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/47995912179.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/jm5t4l9pfrefr48chf49n4g7p5/51243959407.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/23ea98307fa6aeb062b2612e67903502/letafimapisajivurute.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///regidesaposebibodo.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/m470qscn9v0760tkffcrsnmbhg/57993198161.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/dirun.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/f4rngtp137j6h7um5mlg1ui65i/46591826916.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/zopujumekaputowozab.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5ca63e23a---zulosaforuf.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/nozorotimeluxuseteweso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=regezi+sciubba+patologia+bucal+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_off0000c9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B9 18364 bytes
SHA-256: 2addb1fa732b551101a7f30914ef6df986b1d9c55d7fa64fda3f412e3cf11a2f
font_01_sfnt_off0000f97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11191 10936 bytes
SHA-256: 70d8225c0305ee766d704782a422b287f74c9d8516d99fb393aa0b33af97447a

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