Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36af00d29861b88…

MALICIOUS

PDF

77.1 KB Created: 2021-08-19 09:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 7d591ea8e0b7e142cac0f151832f534c SHA-1: bf2ab4cba13786e14a442365f3346039dd3f24b3 SHA-256: c36af00d29861b883ff9dd127738f60efe9cad56106ad74da6778faab3721c03
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=laminas+del+test+de+bender+para+imprimir PDF link annotation
    • http://sbnjl.com/userfiles/files/bulirovetomefew.pdfIn PDF document text
    • http://enricobarraco.com/files/dazuninuviridifoturelul.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a1e8a4dff---38335354909.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbcdd69216---7096650319.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/fevutozejepivateliv.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ba2b0479---berorepenavelotodemurivab.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bf83a398646---64470465180.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adf1821f8ca---xavetisatajexil.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/xugemomokelij.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ca55808457f---88215646112.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/77991107633.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/de87bc5fb4c7340c5d16669f6400542a/9330063517.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/43064723188.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/17168056916.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/26513433224.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e03ceb2c5---20548398019.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/78616785993.pdfIn PDF document text
    • http://midel.me/userfiles/file/68285155790.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/razoduseg.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/pafalobevukudo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE048 10528 bytes
SHA-256: 41bdef6d40e3ea31d6a0334239b00052053c4d6762cc069e2bd553e770a2f794
font_02_sfnt_off0000f7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E8 17716 bytes
SHA-256: f45c4ab0e07dcbd77cee1a809cba07fada584ac5793c52039c3aca0c0c792521

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