Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa97f5035866f33…

MALICIOUS

PDF

78.3 KB Created: 2021-07-06 19:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73982257cb42d0da63809ce865e29471 SHA-1: e1352eeffbf670f50370ef1136715506e6aa183b SHA-256: baa97f5035866f33c21188677840919a5d5724402a85d843e1536dc6f50a512e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a common tactic of using documents to funnel users to external threats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://mientaytourist.com/uploads/files/zagijorewowuvadafuvevonol.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160732a77be3de---76368337646.pdf
    • http://ahkjt.com/upfile/file/52473970837.pdf
    • http://fobosgrunt.ru/files/ckfinder/files/51167607174.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/522853e7e691fc1bff358eac21eb956a/jijurizuf.pdf
    • https://musikkursus.dk/userfiles/file/tivun.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/06446942d44f614ccec81bb1549b35dd/86158401965.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb68836848---gapawibak.pdf
    • http://shinies.ru/img/lib/file/kixekoju.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/3s3kd49ific67ebiiri3ajo070/tanalut.pdf
    • http://quangphong.vn/uploads/image/files/44311048984.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb33ab3b49---molitimemun.pdf
    • http://micronforgacsolo.hu/UserFiles/file/sozogezap.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a03425256fa---lasudifapexi.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf90d775282---78392256471.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160deec2d2ebf8---21704554979.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/nco6t83e888c8pgu3kicn9oeh1/27501930988.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/f394rj42aei876rgp521e4s2mg/24678402891.pdf
    • https://highrise.pl/file/gadekogopiwumovipulod.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160872e953a857---paniboripi.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/noloj82ign94l9ergvk42e0gp6/ronogolinedafo.pdf
    • https://t2sc.me/userfiles/7986520670.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=differentiation+of+functions+of+several+variables
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf3d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3D 16792 bytes
font_01_sfnt_off0000e754.bin
f1973a511281752e06d46b1a2be1b8dece0086cda8ffa3686c7f72ca1efbdb14
pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 10636 bytes
font_02_sfnt_off0000ffdc.bin
6ae5af30bc9b0f776934703f296872c96183ed602d6c5c3107deed5a81ec1ef6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDC 16828 bytes