Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed8aaa291ffc92a…

MALICIOUS

PDF

85.0 KB Created: 2021-09-21 08:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e445407b2950560a109487fda7ea93ff SHA-1: b82c97809fc38f29df3e39e35ba383022192e64f SHA-256: 2ed8aaa291ffc92a6cffefd2348808b7bd068d694bdb83fd73ceddd3d0af21c8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://smidgel.ru/uplcv?utm_term=cast+on+android PDF link annotation
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0f83e4e15---36676537056.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/7d3436144c89f51cfc01a7dc3590fd46/47581609259.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/gozoxogamusi.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/59730716526.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/gozofose.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/4368087387.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bce35745f---86737008637.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/54108054473.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091608335085.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/fagekupufotesaropufo.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/61009633491.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/67502392503.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/867466111.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/41bc85714de198d2336b5f75d664e35f/86895671737.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///88617612231.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/60553882490.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/rixewupinetakexizil.pdfIn PDF document text
    • http://tulga.ru/editor/files/89526178433.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/60250043229.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/tezedaje.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/20300193045.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/pizaviben.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/10474827213.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/53274673341.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_off0000e6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 19016 bytes
SHA-256: 52da4032494f93617578736b1ed509e08f4edf79df8466c87750a31b70d3ff66
font_01_sfnt_off00011802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11802 10092 bytes
SHA-256: 5f9f78f701dfd66a340ccfe57a233a0837f8f3e247a0046b846104c888706625
font_02_sfnt_off00012e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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