Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b82ea92ccf8ab77…

MALICIOUS

PDF

74.0 KB Created: 2021-09-29 06:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d545121eb0a3de072e6a931bffef20c SHA-1: 85d18db8a3a5945c7cca6cc20d003fc927f758b5 SHA-256: 7b82ea92ccf8ab77075874555939adf01b84f1a30a21ec5a00f9ef4b338a8d37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm or phishing lure. The PDF structure and embedded content, though heavily obfuscated, point towards an attempt to redirect users to malicious external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=android+9.0+virtualbox PDF link annotation
    • http://crystaltrade.hu/data/file/56450488662.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9659ec5a1---nugomufonafagidusokuk.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/79502831482.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/q8v19tbj56d798ls3j0hlo6k62/8799912151.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/45232648218.pdfIn PDF document text
    • http://hankaebertova.cz/userfiles/file/1957988455.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/59633403657.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614690e1cb862---50198105421.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/foger.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/wilobaguxefabem.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff8aa82682---60306178059.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/fefasivinotoli.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e83a364293---xibisomeparakawilo.pdfIn PDF document text
    • http://avesta-hmora.boj.se/uploads/userfiles/files/19873029132.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/75830680700.pdfIn PDF document text
    • http://w-mill.jp/images/file/60531329024.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaf719c9e4---32809678874.pdfIn PDF document text
    • http://hy-sf.com/admin/upimg/file///74846914682.pdfIn PDF document text
    • http://inistor.com/ufiles/files/pemezedokijufa.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/fafepevarale.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/75501733472.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/38128291230.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/28163229149.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/21491793779.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_off0000b61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61D 10688 bytes
SHA-256: 4d4104496f1f1e3dded1d10e4830da2407bf4050bcd19046d4a1c1a3d9e46f15
font_01_sfnt_off0000ceb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB8 20784 bytes
SHA-256: 976c8d2a9b026f42ef86aeb9b3bc2696b458622cee3bd50d12fd0f4eac9dcad6
font_02_sfnt_off000102b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.