Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd107198f09367e4…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 00:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 49fe8956b1af4b96e300f9e5cae81371 SHA-1: cb4e512d298c7baf64476778d9c0ff33dff22a37 SHA-256: dd107198f09367e437c1cccee8b570348992c75f83fca559c8a3972c4843ca7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated, but the presence of numerous external links and the overall heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://network-italia.it/file/pejumenujiriruluxezixeje.pdf In PDF document text
    • https://kaplaitalia.it/userfiles/files/bonodozibibe.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/30044103790.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/6fe2310a6b6e61309ab0444106c5a9e6/pibemesebewi.pdfIn PDF document text
    • https://praktijk-fix.nl/userfiles/image/file/74878804921.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb38a9d98b---37325114575.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/51168276803.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/86504472832.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/19364308572.pdfIn PDF document text
    • http://hanauhrova.cz/files/rarufifidirewegosamaj.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/supipamiwisakixis.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134dd2f3d9ac---29237556604.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/54121820260.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/debeduvavojutu.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/dunafuw.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/75134540651.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/1785980066.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/pofopofomebenad.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/zapapaxasaguwowujafesiwul.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/mepapipekufamupavokom.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/5996273685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=apology+letter+for+delay+in+project+completionPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614090d4bb5ca---dixixivixonu.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_off0000d764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD764 17940 bytes
SHA-256: d32b6ba41373870bb16d7c18db7b24460834fc49f067002e3e5a2dc58d7021b8
font_01_sfnt_off000105bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BF 11020 bytes
SHA-256: 84f1547d6ee1b65eee5cbfab3d752107d0da6c9550fe38fed84609d1513b06e4
font_02_sfnt_off00011f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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