Malicious PDF — malware analysis report

Static analysis result for SHA-256 f376c6f935271048…

MALICIOUS

PDF

83.7 KB Created: 2021-09-21 11:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8bafa96231768976746675887b9e8091 SHA-1: dbdcc5f943e6cf49a01a0a28ba2c51d74c6887a8 SHA-256: f376c6f9352710485959764abff8870cafaa610c873c53a970ef2544e61aa17e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a second-stage payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://pixomot.ru/uplcv?utm_term=how+to+upload+photos+to+onedrive+from+android PDF link annotation
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614156fc85671---sujoruxuxewesapaf.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6fb4d512b---76750885908.pdfIn PDF document text
    • https://ibextrail.com/editor-images/12867741126.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4d09b9dff---sonivalunumamufomovudob.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/108693757c31e957b8f6ce173c673cd9/vujexifarojibika.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/28180698992.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/10944502352.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/baluzikul.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/lbt23mr8n8ah4v6tfo1ibb94em/gosonevufajuwi.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/17802037945.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/430c328fc690d4217c9e76252a3112da/29939837708.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/67258288412.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/49324568993.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/jigavoxo.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/38771374879.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3d56f0645---8424364995.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/50327944872.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/10636634239.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/27847061505.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/38296695458.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_off0000e24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24F 17484 bytes
SHA-256: 60b01ccd6827d912bab65346b6655984398bf3690d323614d2b257ebac1b0802
font_01_sfnt_off00010fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA8 11008 bytes
SHA-256: 93f96b6ca425f43418af1b664a2156bf8ccc15cb1a54404233eb1f8bf7371ffe
font_02_sfnt_off00012910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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