Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5233df2fab3092…

MALICIOUS

PDF

78.1 KB Created: 2021-06-28 11:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01fe7da658d04a8fd44ac76b52e3f077 SHA-1: 0549b07bc6309833cb3022cf2f714636798ba492 SHA-256: 7c5233df2fab30920003f694d8f3b1ab0cba5ef2f71ffbd23d90429eb47b1e7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://soba05.org/wp-content/plugins/super-forms/uploads/php/files/818c5d8b4b0c93813587f3ad8d7552af/zemuxazevipasawijoweb.pdf
    • https://eghamatyab.com/basefile/bainbookcom/files/88889854987.pdf
    • https://tort-art.ru/userfiles/file/11227608028.pdf
    • https://thietbidienmanhcuong.com/upload/files/52829302091.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607c125bec464---859279132.pdf
    • http://nanumed.ro/uploads/files/vawezusenesiz.pdf
    • http://saovietgroup.com/upload/FCK/file/6378563062.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/3594adf101fc8745fec7261fef4dc2e6/87578947313.pdf
    • http://meta-min.com/files/binakekotifagubofi.pdf
    • http://king-ber.com/UploadFiles/file/20210622204527665.pdf
    • http://ahcxdq.com/uploads/file/10105838405.pdf
    • http://kasystemofkarate.com/clients/861259/File/jelobukolesaxiwidugekajal.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/4f9kr296p28tj76esrcadqr8ol/dafudazulowetokituwawi.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/b21fd656b8122cba868b9d72070b82eb/tetonemamapiri.pdf
    • http://vladjurnalist.ru/archive/file/1972585480.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160769b9647265---domigiri.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b878ac238e8---98978116118.pdf
    • https://kidneystonetreatment.in/userfiles/files/pesulopid.pdf
    • http://soft-pro.hr/upload/datoteke/58815690423.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ad54a3059---luwupunegoj.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d41e347228a---vekesimare.pdf
    • https://clifestyle.net/uploades/userfiles/file/48809261502.pdf
    • https://prosperitas.be/data/assets/file/60175851676.pdf
    • https://seitonsolutions.com/ci/files/74138079232.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=through+you+i+can+do+anything
    • 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_off0000cdec.bin
ad5fd73a2c1f135ef394bd084cdc57d04438cb41e0776b0e79a7af9d80ffa5ea
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEC 17460 bytes
font_01_sfnt_off0000fb70.bin
36b2a0126956af5b67b2e57d71a84fd3d24f1bceeec3d84058e5f72164257ce5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB70 10480 bytes
font_02_sfnt_off00011306.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11306 16792 bytes