Malicious PDF — malware analysis report

Static analysis result for SHA-256 6863f603c86153ce…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 13:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3392f8f50feed761ba7ef5925f2f40c7 SHA-1: 3a83da0487f6a425ec535169301bda1c5f2667de SHA-256: 6863f603c86153ce8ac5b8d093128581dad1fcb210cc88902e72e24264579c76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads. The embedded URLs suggest a lure related to mobile device compatibility, likely a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://drafthe.ru/uplcv?utm_term=will+iphone+watch+work+with+android PDF link annotation
    • https://csn-alliance.com/data/files/xarukukananubowuwusopozok.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/52462849945.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/milapoxomum.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df6112bcb4---49822513711.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/507004716.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/pskbpnqk19vb8b4kbat18mje13/kowujewubawunifomepiv.pdfIn PDF document text
    • https://festacontinua.it/public/file/52880033846.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/49205129967.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/85429335855.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/92955565551.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/5118590970.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94120995135.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/rixuraz.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/45314433877.pdfIn PDF document text
    • http://esistore.de/userfiles/file/sosov.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e71e6ef37---14681610851.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3ca646ee4---1082074534.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/rukivajodugev.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/ea58b6988fd531abc878089046278c50/73072839558.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/42925966992.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/192b3a4925cac06f3e10d44285236295/64045216692.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/33358360273.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/vosazuradebefitag.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/4417029841.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/28244554381.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/dbc723d7e95a25202b183ebc4a617602/lujigavaxi.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/92251804982.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_off0000d8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D1 16796 bytes
SHA-256: 7a5946866b6de2a2ce58fe13577291957499d1ff9735c72919e0bf513f5239f7
font_01_sfnt_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF2 10612 bytes
SHA-256: 79321440fb6db43168f67ff00b7a90cf889329ae766caab1d143288fac8379ea