Malicious PDF — malware analysis report

Static analysis result for SHA-256 f12502d8d08a3b8a…

MALICIOUS

PDF

74.6 KB Created: 2021-09-28 13:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 012ecad5b3435695676e5f2febdb17f1 SHA-1: 8df2d5858e5e2f570c9ffec7f25ebec2dfc9c8a1 SHA-256: f12502d8d08a3b8a5893e33fdcf8aa8a3e0f73a8bbd09dccd5987cda902079b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to lead the user away from the document to a potentially harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xn--p3t29jo1ed4o4xw.tw/upload/files/zojiselekolegawawe.pdf In PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/59815509059.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/mulugazelixedanizuz.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/xalujubami.pdfIn PDF document text
    • https://webmenuplus.com/images/file/47345488490.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/rudaxojafibekovixese.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/sakoz.pdfIn PDF document text
    • http://jinyezi.cn/upload/84451105074.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/doneruzamozumenojemovi.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/6ukqrae7knc37m5qlftcm3ru55/70706501560.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/putotowimuwapomugowamesal.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/lowipewofam.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/48812973453.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/42468293725.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614949bc1e82e---45581750362.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/161340f7203440---medozakugukesazus.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/5023518866.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/bezapasavewetofezususo.pdfIn PDF document text
    • http://culvercity.ilovepokebar.com/uploads/files/24938026993.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109221326596102.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/66316752756.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151b592d56a9---90497392444.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/lazurofitekatuve.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141487c020d2---jeluxifajamusi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=android+studio+in+kali+linuxPDF 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_off0000ba1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1A 10384 bytes
SHA-256: fe6eef42e7800c3740faf3780c4f36908a98552c7b7c0108d5d9252cbf4752e2
font_01_sfnt_off0000d1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B6 20064 bytes
SHA-256: 4ae6591c65f2e51ea00117a3e6cfe4e71c24a787083ac889108978d398f1b6e2
font_02_sfnt_off00010480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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