Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8945eea7f86cbf2…

MALICIOUS

PDF

81.2 KB Created: 2021-09-24 04:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e780e8ee621d3a8c9f15145ccc3f929f SHA-1: de2109b21d156113eacb203164b1ca7c906fed51 SHA-256: e8945eea7f86cbf2f2499156ee71a0d530d38a54a2e2c1a52947ecc468334d1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://medvor.ru/uplcv?utm_term=live+wallpaper+3d+apk PDF link annotation
    • http://prograsifkalip.com/files/12423769182.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/rijugagoxirawubogato.pdfIn PDF document text
    • http://unsersohn.com/images/file/buguzeziziramatoxufuxape.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613854aac291b---79345280362.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/pq7b9m8n8k641rmd3a7h1n3g87/57930596088.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/46108488814.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161442efe70cbb---fivimawepafulatugaveser.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/8367099d59c2fa32e04c194b538e1865/sejok.pdfIn PDF document text
    • http://jawarakreasi.com/file/71583942575.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/0f46a86d5cb825d04d7fa5ee62be59ee/10956055798.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/1118207378.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/sikakuvasemudububidun.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/zuwobegu.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/poruwepabedisoxivimu.pdfIn PDF document text
    • https://digicpictures.com/downloads/86362464812.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/c2a2bd5c7a58d8a3e447c66745f47594/jefelisunagezo.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/tavepewetosibuj.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/18032850068.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/puvikalenevila.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/8441053890.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/82123552673.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/15076324757.pdfIn PDF document text
    • https://aashianarealty.com/file/rojevevivotafabaru.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/k94vnt7mjg9b710tuvhr9l77md/finonazudezibuvapowogo.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_off0000d7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C5 10268 bytes
SHA-256: d8ad6af0d69d0675523bd1b65c5daa50392da014e367ce88f2e1838436e3b560
font_01_sfnt_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 18460 bytes
SHA-256: e8d867ae36fdb37fbd353696b1f368b4d2199b614fc89d1b96e273ba41d4a188
font_02_sfnt_off00011f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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