Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13d38baa94a2b59…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 07:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f0fdca505fe032d1ffb94610cd55b837 SHA-1: c409b4fa7f27449b665c55645de30956d852e7cd SHA-256: f13d38baa94a2b59bd32b82343cd8efc50c8494c9a314ba790c03af0ee580cd7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier also strongly flagged this PDF as malicious. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bertrandetgastineaudesigners.com/userfiles/file/26610012219.pdf In PDF document text
    • http://archerelectricsupply.com/userfiles/file/ragozubupaxapuzugisut.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/pebexusilazeniz.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161254e82ce8ad---90560990318.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/lovasinibo.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/witawefojenemusagavuj.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/22471325429.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/dujopetuneve.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/66406370406.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/30683773233.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/26753592056.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607940ea80bd5---51710762333.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/881d0277b055f34adf3b992cbccd3de6/warakonediferenepez.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/47581784944.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/kojazufozigumonawufefen.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/16900552324.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607247eff3273---5129368193.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/sikuwalazuxajazi.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/b6218256a2590fa4784c0506a316d7e5/gebanogamemexu.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c990e1703---37975552721.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef7bb60160---gukapinivenuzonejedusagiv.pdfIn PDF document text
    • https://tepihtrava.rs//files/39396084446.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/451328271.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/wenupubijanofanefesari.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/94018926726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=principios+de+asepsia+y+antisepsia+quirurgica+pdfPDF 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_off0000d8b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B8 11108 bytes
SHA-256: 0bb8b2116ffbd2853a96ef1d8c94ead2cc54774a4707af1b3c80902c8d24d57e
font_01_sfnt_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A60 18468 bytes
SHA-256: 477f9b367e4b5060040a654e37ea9ffb09d1a340bdb1a4fa4f69ffd0064cb12e

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