Malicious PDF — malware analysis report

Static analysis result for SHA-256 36de56736631929e…

MALICIOUS

PDF

79.1 KB Created: 2021-09-17 03:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4cb8f86d84ce82ae505983128117c3e0 SHA-1: 3ba20bd7e79a65f4f765cc8a4685138313aa7d96 SHA-256: 36de56736631929ea552be751974798983a064ddd232888b853000bf8b33f40b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body was unreadable, but the presence of numerous external URIs and the 'link farm' heuristic strongly indicate a phishing or malware distribution attempt.

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 http://merlegdoktor.hu/tmp/19408353872.pdf In PDF document text
    • http://epoxidice.ro/mm/file/493414451.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/lofanikalawan.pdfIn PDF document text
    • http://vector-food.com/userfiles/file/newituzugufegalupizoduvin.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f32fb28beb---xofeweroj.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/jarujobejiwotawobaw.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/jedojeturovenudo.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/kusizugiborerapudaxod.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/8139956839.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/vezozoguxujok.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/85164197792.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/7728c515b04a4e883d1368f5b7bf4467/56526276004.pdfIn PDF document text
    • http://inkjetartandimage.com/Uploads/file/64198320999.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/vagokaxelazufuzikamonax.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/gituk.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/losirekuzokivakikuparabu.pdfIn PDF document text
    • https://rotitelor.com/contents/files/19638196745.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4b712eea714c1d14a98ab2331d98223b/33669943353.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/wujimasibotusubetof.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/6683510208.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///luremonurubanavizovesov.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/kutole.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/karuwarufe.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/vumedilumivamofuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=android+tv+on+raspberry+pi+2PDF 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_off0000cdd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD1 10760 bytes
SHA-256: 31e978212ee7392beaa782c4f4c7730791febdac586a012f88905ffdbf4588e4
font_01_sfnt_off0000e692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE692 18688 bytes
SHA-256: 8309f83e49cddd105ee69a302b709385cc32982ad7b49637bc4fcb2c2746c30f
font_02_sfnt_off000116eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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