Malicious PDF — malware analysis report

Static analysis result for SHA-256 913eb37ca53f54e1…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 12:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3cd1877484780f06cd6d01f07e720bbb SHA-1: 4871f9304c401e3c7cacee5acf97a512a45b8702 SHA-256: 913eb37ca53f54e1aa640655c1cbc97cf7a97e732f5c2faecfc83726bf8914d3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm designed to redirect users to malicious sites. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cructi.ru/uplcv?utm_term=showing+wifi+password+on+android PDF link annotation
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374bbf100de---wusularamobagewumumasabuf.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/27075415907.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/vimulatuzibolig.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/24590709126.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/teguruvub.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/54255662377.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/9fefcf3b9db58e290ce52d6990269a29/4311545555.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/tufixibobi.pdfIn PDF document text
    • https://frisch.ro/files/file/17812119130.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///7557792133.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139b248d89b6---91795309723.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/xebabepifaj.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/83688539976.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/47147934131.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/pevoribugajidor.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/sejabib.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/porozisezasiwatafeka.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/vagepabu.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/fetinatubomewobasalijesup.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/67228530325.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/28144741649.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/wugot.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/16253110073.pdfIn PDF document text
    • http://kelvista.lt/images/files/73634161099.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_off0000d910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 17776 bytes
SHA-256: 7eebc0627708a260da94922fb8f694cac37e41c6ceed34ae058b94893273d66e
font_01_sfnt_off00010694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10694 10660 bytes
SHA-256: 411ae9cdd9041d694379a329da5e525a08ab38bec769e36747e1d680d1ae0b62
font_02_sfnt_off00011ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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