Malicious PDF — malware analysis report

Static analysis result for SHA-256 0443b9f77a43b113…

MALICIOUS

PDF

91.2 KB Created: 2021-08-21 10:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4d35d9fab454a111bbf0fedb6b175088 SHA-1: f7198d7ce1fc57e52cd6e4ed2bf902371d7663a1 SHA-256: 0443b9f77a43b1134c035eef087209dfcd8ed9da347df6abbbc578df3bd53277
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://angkoronetour.com/userfiles/file/pugusowotaz.pdf In PDF document text
    • http://recit-de-vie.fr/userfiles/file/gosojenopiru.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160ac723ccd56d---xixexikol.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/kojugeg.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/3049536614.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d4caecc27---89626863917.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5793253919.pdfIn PDF document text
    • http://allasclub.com/campannas/file/24318635864.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16098a5e152a5e---65771193354.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/89921085790.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/870e1fd81ed0628ed7cabcf1e0466678/begudikimejotuk.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/botukabutowa.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/kv5cdj42v4bmp9jachvcf5n5or/38953181291.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/bf28be2d4d3b831d452c0a5806d04222/76222200509.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/78554023582.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee649b73774---wezezupejubawapo.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/94319584253.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/nepifipap.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/moroziduxetetezivomar.pdfIn PDF document text
    • https://dm288.rs/slicice/file/15499680184.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c251d6b53c---merisineluvagukujekibe.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/b7ac00afc33591813bcba4e969bcbd4d/11530066273.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/senilusef.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/53919ab8dcba7f4079ae5a854b97a581/sipodasesu.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a711cc4d565---24465320324.pdfIn PDF document text
    • https://fallsplat.se/file/49130473704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ejercicios+resueltos+de+energia+interna+termodinamica+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_off0000f9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F7 11176 bytes
SHA-256: a80cb08f01cacad194737c18cd53e099d5cf223ad3da23d4f0a74e175cad538c
font_01_sfnt_off000113d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D2 18728 bytes
SHA-256: b326e52c53c77ccc34fefe608d05025a2e2fe46fbd109c94f1d4690e537763de
font_02_sfnt_off00014467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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