Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15310f12498841b…

MALICIOUS

PDF

76.2 KB Created: 2021-09-26 21:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7be46204aa4aa468fbcd6f83dc88ec4e SHA-1: 5d2fe3f0ee54a94a9ff968eed9df0255efd38ee9 SHA-256: f15310f12498841be3458b3ce1e6b99c53091e887d41de3e9336234e97db9c9e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm or phishing lure. The heuristic 'SE_CALLBACK_LURE' further indicates a potential callback phishing or tech-support scam pattern, aiming to trick users into contacting malicious actors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=blade+runner+2049+full+movie+watch+online PDF link annotation
    • http://aaykpn.com/uploads/editor/files/laxurafipitegekogimupi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f07a919a4a---salufosomako.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/golepevozeboxis.pdfIn PDF document text
    • http://vodnik48.ru/content/file/tipokitesam.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/mufovupewasoguxasike.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/68543037603.pdfIn PDF document text
    • http://thoitrangvabaoho.com/Images_upload/files/gakitajigixisix.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/35562597015.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/7efff735bf4dbbf93cd45df43bf0bf47/37112175348.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/pomevuvejar.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/getelotelotol.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/fumarisedisatuzaw.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/vexikobitedimukisujalez.pdfIn PDF document text
    • http://bibikid.ru/upload/58972581620.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210911172312.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161423f4b75a8c---rupomage.pdfIn PDF document text
    • http://iccarrentals.com/files/file/79854312801.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/20373701702.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/51701493349.pdfIn PDF document text
    • http://rinsacars.com/files/others/26338848819.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/zejop.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/16492704501.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/62327853060.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/60584078207.pdfIn PDF document text
    • http://4226080.kad.tw/kads/ckfinder/userfiles/files/komox.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_off0000be52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE52 19588 bytes
SHA-256: 44c80786e8928bfe6f24e055556d05633ba634c42dd83da604a2de80c5b817ba
font_01_sfnt_off0000f04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10866 11364 bytes
SHA-256: 15cacdd2161296a16c5c3e372b49af8aaa49d4e17bbb330c7d7a2c7332ad0124