Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a40e5c3e4c611b…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 16:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 55f0ee7c89cdcf34b7746a62a11f24c9 SHA-1: d0877c8425cfb3c2263cf0aa1954ac3859dc031b SHA-256: f0a40e5c3e4c611b50e3ee4329a4c5a934d75e7d958220e5c11a58fe7df273f5
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 0.9980

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=things+to+learn+in+life+pdf PDF link annotation
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/c7je7ajujuu2orplvvehocv6lk/rotoz.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/konaluxusamoxuje.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a2a11b53a---davajitajit.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/mavowa.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/zewufizuvobaref.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d78442c3eeccbf79c90d78e82c51582f/gomiwiw.pdfIn PDF document text
    • http://allasclub.com/campannas/file/73039486342.pdfIn PDF document text
    • https://ijp2.com/contents//files/19178216821.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/vozikozagixisokunajij.pdfIn PDF document text
    • http://suachuathietbi.com/upload/files/53526133696.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/4235796794.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889dee16fb5---nuwupiluwamiluzasej.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/dojodaxexuxetoji.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/39144109657.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/47fd51ec4c8e84b6a7e950995834938a/93562864592.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/45675376740.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/97619607427.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843432ec224---xefimumoman.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/67374181943.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160fadb0bb16ca---sosibe.pdfIn PDF document text
    • http://022-web.cn/uploadfile/file/20210722175253527.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/52565738961.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_off0000e840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE840 17740 bytes
SHA-256: ad57cea68438d45429bc47459501f11895d871fa6b42b6ee4dd851a4d7794666
font_01_sfnt_off0001164d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164D 10740 bytes
SHA-256: 3c0774297d833262d971fed8a64faabab63b07c6a3a5c50397820c560e9d0da7
font_02_sfnt_off00012eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1