Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48b0f61dc01ef45…

MALICIOUS

PDF

87.2 KB Created: 2021-09-14 00:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7ec5040183be2df8347c2d4b1f4e38c4 SHA-1: 2d2c13938978b30ebf573f0d7d579d65f10ffdd1 SHA-256: a48b0f61dc01ef451e8a8d518a1bfd67a8219edbcabd126a6f32ffba0b2b437c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' directly support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.bash.cl/media/file/rikiwexemevalajidopafozax.pdf In PDF document text
    • http://theofficeplus.com/userfiles/file/15842136645.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/zamarudagoluvukavone.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16133d2cbd4df1---58709402925.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/fonixos.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613361c138353---busuxotilen.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/613576c48c906a759da980941c7808f9/75229339699.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/61566867639.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/s232j3jph4kfg07remftad93nedvsrl5/venipirupabejumugo.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/43361245506.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/85476844134.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/2882815261.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbde014bb8---bomugosulumazuwakimolut.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/xogatokidepotubirib.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/7afc3fbca5153bc5e548c822371998a2/35401068878.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/repunudotamufida.pdfIn PDF document text
    • https://pecintajp.com/contents/files/18692408949.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/87362415905.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/15144250008.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/jefijepo.pdfIn PDF document text
    • http://becucci.it/userfiles/files/15368673076.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/sekiwafedufofanowapexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+hide+games+on+androidPDF 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_off0000f2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FC 17220 bytes
SHA-256: 37d041145fcfd72bfe13f9d4379a9a8a2e89d5aaf89f877a339e722ad6c2fa95
font_01_sfnt_off00011f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4B 10728 bytes
SHA-256: 6c9fe55074afa0a84007e78b0cf67326ef6d4e70869709fd8199f6512c05f747
font_02_sfnt_off00013792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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