Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d83d9b42e71ae84…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 09:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 907b97df6802a3e9fa5c3f7477ab7fe5 SHA-1: d336ff49c4ac84027ab5fb69b6061f5ae5dc6c5f SHA-256: 5d83d9b42e71ae84c8cb1a91fcfa90bc8d51f2521e73564b7c3cf8184f91b79b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://bukharaatlanta.com/sites/default/files/file/3873155386.pdf In PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb7fa25895---34755761698.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e361b3aec---koxizonorob.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/67628971032.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/13620513631.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021072606282466.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b550ee9af---bixufovilufifulosoza.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/vv71742pgathprko98erm1i2d1/34376380359.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbadaacf54a---xevamalulu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161292f7c3c650---zinidowusoladoredizopad.pdfIn PDF document text
    • https://tekmaker.com/upload/files/werevigub.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/3165f407b169de51a96aee8d82b45db1/xumedeb.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ejn9cp7hj16tjv7qgm9j2klj93/12478786210.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/mezupapujasafomazo.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/xukobubu.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/pafilugex.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/27393443819.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/74a9e0def5334b23413b4f1f530f8e1e/pujade.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/bff17816762dcb1e2e7add40c189976a/xaxanenonozotukuwako.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161116de86201c---68326395305.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6323eea4da8cdebc18f184e2941b952e/nixenobi.pdfIn PDF document text
    • http://robbes.nl/media/files/madunokifa.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/zupexuzadoxisodaximeda.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/pitumu.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/vexegodelek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=environment+health+and+safety+book+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_off0000e202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 11156 bytes
SHA-256: 43f3003bdaa2d3718f7d9e39dc8199c06e5ee24045b1cfc867be5dfc28819db6
font_01_sfnt_off0000fbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAE 17232 bytes
SHA-256: 5792f6f10c2c18c4a99237b84c913c8c56650e6ad2e24529321ca3d2f4108006
font_02_sfnt_off00012865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1