Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cb16f4d690476e3…

MALICIOUS

PDF

86.2 KB Created: 2021-10-05 23:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 02081d0ac1411efb458658018438e3b1 SHA-1: edae824db58c0efe7111ec4993d74d3177b2adbb SHA-256: 4cb16f4d690476e3476e9516b2e200dc2dc475fb4320f4dd480db60083741a46
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://self119.net/upload/userfiles/2021/09/files/210927165035.pdf In PDF document text
    • http://soles2walk.cz/data/file/mowodovurawamivexetorole.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202110040325372644.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/zubosatujisubunepijisipo.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/53004385388.pdfIn PDF document text
    • https://razredna-nastava.net/files/17317886497.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613030976c402---zakawuxadoxubifenuzudu.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/nowogimotusetilek.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/joxabetuvo.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/49508952554.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/29933380.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161566843885a0---83182006703.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/kenamajokit.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/9657bbde4a39263b6de328c7de75f00f/43102393197.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d6f7dd97b---88762270524.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/94869341717.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/50435244519.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/dipovuzokusutipa.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/tenogomubuneritew.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/92408205053.pdfIn PDF document text
    • http://ipllaser.in/uploads/27412086229.pdfIn PDF document text
    • http://hkalc.com/userfiles/41340288639.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/vedud.pdfIn PDF document text
    • https://ksboutlet.com/file/files/5208106584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mischievous+kiss+love+in+tokyo+streamingPDF link annotation
    • 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_off0000e5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 11044 bytes
SHA-256: 5bddc82d33d0e8aa78976aabce9ce8a90ee289393aa52ac3f1b53bf17c6cc358
font_02_sfnt_off0001178c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178C 19884 bytes
SHA-256: 68e7c9111212dd962e15ca158fab785cada7a632dafbeaf3e84f513b5661d4e2

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