Malicious PDF — malware analysis report

Static analysis result for SHA-256 d337394f7a2b369c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-21 07:27:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: afaada2d5b816f8bf7a6f717b00bbc4a SHA-1: b58eb186fb9748dba0163f5c9e4422d21a9596f1 SHA-256: d337394f7a2b369c8cdb676a6ff02ff4511d70923533ce48a8e8760767061057
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://kamhosting.nl/ckfinder/userfiles/files/29954747246.pdf In PDF document text
    • https://netiko.fr/img/Data/file/89252278341.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/noxamepej.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/14745852972.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/46687032345.pdfIn PDF document text
    • https://satesayap.com/contents/files/mizezarenaveb.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/naduporiwodal.pdfIn PDF document text
    • http://yuha.be/_files/file/34395669389.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/zepalejedesiluz.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/97609663526.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/punurinewositedare.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146f0a617968---76071244159.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/87955276853.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/xagojesigigupozixu.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/palezazitagewekeva.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/19361253952.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/manevizumelipufosogin.pdfIn PDF document text
    • https://servauto.fr/img/user/file/2972559137.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/29723920494.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161395f86303a6---52500181425.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/16716638109.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/81742274782.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/pupowizazifiro.pdfIn PDF document text
    • http://topp.pl/_topp/file/90875159770.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/xutagepudani.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9172a72f7---50777963031.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/5d8bbc688fa90f44de1ccf06cb3c05eb/tisutakivuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=application+emoji+iphone+sur+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_off0000d322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD322 10988 bytes
SHA-256: 56cb46fcf85ecba736c958a39cc1a466738a74c2a5f746de9d49a07123e4f26b
font_01_sfnt_off0000ec74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10486 19548 bytes
SHA-256: debd5faaadcf802a2052891bf602e64702feb19f324b945cf0d59e03b1bb0c5a

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