Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4a69f61f74780d…

MALICIOUS

PDF

83.6 KB Created: 2021-09-11 03:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 01d618d0a432cdfb931eab06c37fceb5 SHA-1: c471eb09a43c06eaa5356aa0ac46e53206f423f0 SHA-256: ca4a69f61f74780d4e1e4a294f73ad009a3efb0ce71813bd5396572dd892a7d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document acts as a link farm, directing users to compromised WordPress upload directories and other disposable hosting sites. These links likely serve as a lure to download further payloads or redirect to phishing pages, as indicated by the ClamAV detection and ML classifier.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://krisoc.ru/uplcv?utm_term=where+are+default+ringtones+stored+on+android PDF link annotation
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d1c14661c5a99dcc163db9c149f4e2e2/sejevivo.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/1218556908.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/34094343455.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/83301944049.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/soxolagazak.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/kiduwutaf.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/253534bfff933fbdbb620212d30be42a/kububuzipozi.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/38488503108.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/rugotixizonunodemitobopo.pdfIn PDF document text
    • http://marymo.ru/uploads/files/xudidusitesirajarulabuj.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/41939047612.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/febaretovamebatubekeb.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/98137360725.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/9db313efa6572faf9af33e834dcdc6db/gatewanideta.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/81415062092.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/59662962650.pdfIn PDF document text
    • https://equinox-e.com/upload/files/ledasivovoki.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/tonesosoxis.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/fanozedosadurunaronesaw.pdfIn PDF document text
    • http://leoclubmarsala.it/userfiles/files/darotifuxe.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/nebajifena.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad96c2ca5---1763329746.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/161384345d6b08---mubimig.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_off0000e18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99D 17948 bytes
SHA-256: 90a396c11d1c902cb6cca9abeb6f77818aa82379dc82c197d2029a3844a20841
font_02_sfnt_off0001280c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280C 10724 bytes
SHA-256: 79ee9732770669b4908a8659b0769b13c0d21b5b0d6bec38748a9859314f6f7b

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