Malicious PDF — malware analysis report

Static analysis result for SHA-256 a922e6098b9a5d5a…

MALICIOUS

PDF

77.0 KB Created: 2021-09-29 09:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4c10005919f8631a6cd392238896842c SHA-1: 1be1dbe83e8cc00069617f0a83927d592f22371b SHA-256: a922e6098b9a5d5a8d73baedbdceca0f0c1bd6ba75ab9c76c4ae2e18e88b31e5
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is identified as a link farm pointing to compromised WordPress upload storage and other disposable hosting. This suggests the document is designed to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://waycreon.net/bhaskar/yii/upload/files/40916660699.pdf In PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/nisawivupezoxedopo.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/eb76cf5e17cfd06308e427222d796943/kebozaraduvobi.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/tobogeserazopapanujupi.pdfIn PDF document text
    • http://www.ntweac.edu.hk/admin/ckfinder/userfiles/files/97631199121.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/lilejenim.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/2k4ev04o9emqbp2gqhstkmugaa/3232498774.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/88019190721.pdfIn PDF document text
    • http://coachhouse.info/assets/file/95907822975.pdfIn PDF document text
    • http://scsytech.com/upload/files/wukodafofilujemosi.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/bomese.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/8965676491.pdfIn PDF document text
    • http://schubert-hh.de/image/file/70493553119.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/jixekugumaxarajatewilera.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/kobaniwig.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/xegokukumatimajexo.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141688eedc6f---juxosepeza.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfba8b7681---pinupagilufagixovuzi.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/kalemazofijovusuxupome.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/sqfk8ar0j77ie34qp8dtntd63f/14834054557.pdfIn PDF document text
    • https://marlin-shop.ru/ckfinder/userfiles/files/53274802096.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/26773891963.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/gulobuvuzazosamob.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2e9108f24b68d91086c5d3b0b18366b4/55899269673.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/45809763766.pdfIn PDF document text
    • http://rentaruedas.com/files/others/poxozudesozomukoxupaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+little+book+of+life+hacks+pdf+freePDF 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_off0000c371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC371 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB88 10808 bytes
SHA-256: d3a5b1f80084ba54355f48a381b73159382cdc4ca5bcbf1e10422bd491ca0b0d
font_02_sfnt_off0000f452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF452 19032 bytes
SHA-256: b1dbeca661366d694ef7c104dd485828426f8dccf2b2ea21f5f980d8bf773713