Malicious PDF — malware analysis report

Static analysis result for SHA-256 17e0f0adf1567f65…

MALICIOUS

PDF

77.7 KB Created: 2021-09-23 22:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a4a49ffca0a6db8a3f5536698053114a SHA-1: 5309a7a76cc4587ccbc20dd40faac62d36371e77 SHA-256: 17e0f0adf1567f659f7444951960cac002ee15ab692b5fdaa0c847204eb4b317
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farm heuristics strongly suggests the PDF's primary purpose is to redirect users to potentially malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://oniceh.ru/uplcv?utm_term=dbs+broly+full+movie+online PDF link annotation
    • https://itandem.net/ckfinder/userfiles/files/lijuxakekasozuzibati.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/punuda.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/gidavukajekezuniwevetuj.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161489ed07b33d---54975876084.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/28033663644.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/nadidefuverofuruja.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/51888412685.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/bidebapilomomifujo.pdfIn PDF document text
    • https://haidangpc.com/contents/files/vuzomi.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/76695291234.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/30537320277.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bfc35d9869---83162831525.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372dfa29d4c---lexubisojatomipijav.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/95510994960.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/33817962489.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/53372004854.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/72861964261.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_off0000ce24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 10536 bytes
SHA-256: 6bf0b417398eeebc97eea45605237d282936beb046a44e9ae32e946f29a01188
font_02_sfnt_off0000fe39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE39 17076 bytes
SHA-256: 8aac2ba4b4ab82197bba25f45076364a9fad6738e8644f9928d817dbdc10147c

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