Malicious PDF — malware analysis report

Static analysis result for SHA-256 18693d7610dabb5a…

MALICIOUS

PDF

111.5 KB Created: 2021-07-14 03:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 84e56aa3f7290058b1dc24a98a3912eb SHA-1: 0cacdd2feeb8f3bfeb4926b7f2f843ffa9eb8649 SHA-256: 18693d7610dabb5a3c54e7daaf58f0f407d193654916b4465a5b9e5e40e121af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to phishing or malware distribution sites. The embedded URLs and link farm structure strongly indicate a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crewmak.ru/uplcv?utm_term=importance+of+safety+and+security+in+tourism+pdf PDF link annotation
    • http://bogelaipigeon.com/upload/file/89717756309.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a7957f444---64252182085.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b623ae8c672---37246832650.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///39596638776.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f2ec4b517---3458128168.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b69836fbc6---zatadekigezod.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/48817650884.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6f5a8e5b535761c01ebbdb26f557a8f9/65974976801.pdfIn PDF document text
    • http://hydrem.ru/images/file/defut.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ae724039f---finix.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea5354f25f---69319219307.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/9c3dfb1d7a4effbcde6f69275e602a98/votiwekekudedasobupimumad.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/df50461210f77a6fc7d09c2354e2cfbd/sagulo.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/f2hokte6hq7u1e3kcrg84ho487/55319596746.pdfIn PDF document text
    • http://atek-ent.com/upload/file/74842841132.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/rapogifosumez.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/1t2u7fv9lhrh2cjvkbks8rp74f/78465942218.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076bdea7f199---wowubagikuzagubared.pdfIn PDF document text
    • http://afro-safari.com/upload/files/lamulibi.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/rlckc6he8fqdoecj07ccuuakei/gemunojaralimakutodobinop.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/56367672948.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/9b1fdfd4f7dd8ce5431aa0fd00f196d9/46668121756.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea7f3bfa8f---vosugigufugori.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_off00015222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15222 17420 bytes
SHA-256: 9805472c2029481c5c735207d370757c8449a058388d79838270a0e146f04dab
font_01_sfnt_off00017f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19769 10900 bytes
SHA-256: e334a8b16dfd026404e85c992f0aeb06bccb387e9eb34077ad342c783aa0bc5a

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