Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81b59165fd22875…

MALICIOUS

PDF

76.7 KB Created: 2021-08-23 10:24:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e0bcaa4b938809e7d7946c3ab68e68d2 SHA-1: a6eaa797c15beb0b136501e757d38130ea04285f SHA-256: c81b59165fd22875fc73cfc8da88436c417f736a64c79df74d4959b403ccc817
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or using disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and IP address literals further supports this. No scripts were extracted, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pistant.ru/uplcv?utm_term=life+insurance+is PDF link annotation
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bb3184bca---bikowulobedanerevebewi.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/20534257710.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0b201c883---lulugeludir.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/86345h8mgk9jpsvtrdu7012aic/44426964142.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/2ab92285cfa6acb58352ce4638bd0998/67363753675.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af3dd5c37cf---86075357708.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/gagiz.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/bef5b18o9r27bdt8t7rugr40ku/lepotuzoj.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/95878122793.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/loxapugalewagelupudikarat.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/47412674853.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/3388881151.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/42ef02de457660b3ac095fd9a4d18b98/legeka.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/24693434641.pdfPDF link annotation
    • https://bakwanudang.com/contents//files/63795696723.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075180481556---fefumonafewox.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/70048766716.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a0eb5e5e7---fowonuroduni.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16105c7c84cca6---sirizukubiminu.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/8ab4d7cf9318a13d8d879770d443ed32/48491925717.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e32e8cec0---musaxugegex.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/5641253311.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_off0000ccfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFE 15880 bytes
SHA-256: a446de2f5ce87e975b6ab9395671fbc425e0f0c4c79ab79cfeb5b4ec785053c3
font_01_sfnt_off0000f597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAE 10124 bytes
SHA-256: 42ca9d635bb9e7bddb0caafea44e03fb0fc3bdbec576dfbb20dfcd1986a45d72

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