Malicious PDF — malware analysis report

Static analysis result for SHA-256 1253b074eade99cf…

MALICIOUS

PDF

90.8 KB Created: 2021-09-02 04:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 05f4fddd261429bb896fd5212d510b08 SHA-1: 62628debc0fefb269904793cebbac1536ef7ce92 SHA-256: 1253b074eade99cfcd3d784bb1db39d16031c3cf3e1881d35019e5741105cd1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised websites or link farms, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pixomot.ru/uplcv?utm_term=average+product+of+labour+and+marginal+product+of+labour PDF link annotation
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/76293fc11d26d233f0c91a67d61e6c84/metinew.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/fubaz.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/zosedozobewitabofem.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/65211147413.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fea7985bac319aa7e4e46ad103891b40/rewojorojexababoxabope.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098496a8bed9---fetegivadepabu.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/savakino.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f20d7571c---68821185345.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/8698d098c5d8f150fd6864e48eb1376f/pasepakeranaxisamavaxeb.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/7035266856.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/25890720435.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/xaturetakabefa.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/c21f6a66df55410ad8a74bb4c67d6d48/1460206526.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b856b55815c---vopuvojopizel.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5869b9702d---35293738115.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/xujaz.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/45766956407.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/58783354736.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160921aca764ac---6709962815.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc6bf3a02---fowemaliluvavupotinuper.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/zijuvewagofitarazisarikab.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c57ce470234---69997268106.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_off0000fce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE8 11084 bytes
SHA-256: 948db1e3f753cb8bff4c096cbfd2f18b913df9c5afe698bf4da37b76fc094b00
font_01_sfnt_off00011641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11641 17860 bytes
SHA-256: c79cddabc736a7bebe068450c8987ab87dc9f5ad2e5101dd1e66ec8fdbe73575
font_02_sfnt_off00014477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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