Malicious PDF — malware analysis report

Static analysis result for SHA-256 1667038ca289e0da…

MALICIOUS

PDF

103.5 KB Created: 2021-09-08 11:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ec85453ec2209c9ea5e50fa1d6ccfadb SHA-1: 97f4c122edb65f92f9ed0554af201ffabe558fa9 SHA-256: 1667038ca289e0dac9684896463ad539127b8532cc3f3cc2c2f8789b3aaec214
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and link farm structure point towards an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://coretry.ru/uplcv?utm_term=anycubic+kossel+linear+plus+user+manual PDF link annotation
    • http://ekotronic.eu/files/file/tumejemosasomezimudida.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/piteputamozixe.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3f7f37cec---zulezizitezelarin.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608f593ca6ac6---waxegipato.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/kixedulivaxabadogogu.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/18163676483.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/134da769cf752f8a7e479ed8dd37ae76/67257782551.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/kuzafosijujivo.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202108131859218822.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b7e8234d---lolopabekavekivuzapuse.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a7031f869a4---xekotepotoropotinamo.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/74489806811.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/8481681133.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/3637057281.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/64667466925.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c57b291502---norinex.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/salodo.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/16859317886.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/79987171217.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/791817bdfd6ea622b12579222433dbca/rikiguvejo.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/21632970349.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff033fe2ac4---97347942115.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/702858dcd0c8f731aa35f95b90ba2999/foledumewadove.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/minusuribak.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/24265680422.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_off00012b1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1F 10864 bytes
SHA-256: 594af556e33c388d528cbfff372a192ac5abb0a09e0e86440d5a62ea56012180
font_01_sfnt_off0001440b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440B 19700 bytes
SHA-256: 76adf58f5a3141ee50205abda5707a7112c5f84ee390b7e8fdbffe42a7137b45
font_02_sfnt_off0001782d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1782D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1