Malicious PDF — malware analysis report

Static analysis result for SHA-256 4696cf57b681feed…

MALICIOUS

PDF

122.9 KB Created: 2021-09-03 11:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f4467097a827f332e291e6f8e111dca5 SHA-1: acf6586c1f1303ef9acbd93e72bc21f5b4c52d91 SHA-256: 4696cf57b681feed67de8123ce7db8b2d3ca47c94602fef874d2fc3abaa01c4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of external URIs and compromised CMS upload links points to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wastran.ru/uplcv?utm_term=arabic+subject+pronouns+worksheet PDF link annotation
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c8feafa384a---38131684482.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16088a97ddb27e---lutomi.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f27811d71eb---rizidamupakitix.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/l68gsfjhmbg6p5sk4csnphtcvr/livozobixusuretu.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/72499294840.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/d41cee318c7ea26a624b3597fb150b77/mamalurijewebepopenovano.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/29c33aa628e169da708aa46501cfd3b6/26523920573.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c43e9ee8a5---wugufudixugeriwozulem.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/gunuvajolisuxare.pdfIn PDF document text
    • http://vangphugia.com/userfiles/file/77367423795.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161255c77659f3---woduwitotipi.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098c14012db2---tidavuwuxe.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/podenedonotipodese.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ed8ebd3a9---zetodazapodonekas.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/16880380703.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161133f85a1987---sedov.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/lafefixetebuge.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/5aa02dcacdab89d599a46a6a73d07f2f/kixexipo.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/e6e4210ffeaa16fc8263d0cc2ffa7448/81920319277.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/55078736347.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/xalewaladikemusadozi.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_off0001719d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1719D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000189b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189B4 10952 bytes
SHA-256: 5cbee644849b18095a2298cda246015178c40810185aaa0ca45365f9101374de
font_02_sfnt_off0001a2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2F2 22548 bytes
SHA-256: 85b69895a847b3b4ba94d6da24c14580017c035666982766827beb62d2543860

Open this report in the interactive analyzer, or submit your own file for analysis.