Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec342706e5efdfda…

MALICIOUS

PDF

84.1 KB Created: 2021-09-04 17:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 87e008b6ce847d9127a6cd2f06c9faf4 SHA-1: d9d42507ce907322bbce7ec11edaa71e06706f7d SHA-256: ec342706e5efdfda1145b4c9ccb68340e252385c98f6b2ac670ae2b935fd0d5c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate the document functions as a link farm, containing numerous external URIs pointing to compromised WordPress uploads and disposable hosting. These links are likely intended to lead users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=femfat+weld+manual PDF link annotation
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b745f314870---37374164557.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/47180500386.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5dee0be06---pireruzukojivudunojinuk.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/gibuk.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/37059470921.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/dovinifotokabewer.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/naduvepun.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/48973464240.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/43bba504bf48d2643f0877af9d1750b3/gabobumesepoti.pdfIn PDF document text
    • https://hinaweb.com/upload/file/kakadejejusixedilefor.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/568984063.pdfIn PDF document text
    • http://thegioioto.store/upload/files/kujibapogemaxo.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/sizapojaxunurugufedajal.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7ae05bc81---notixuzodukamitanegex.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/36895604673.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/gugbva1jnv1tq9v0q6q2bcath7/63452855745.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/6161bnb20fv0422d6v0jhsucgg/31455476817.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072f321ba563---78245406094.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/gezolujiwazaminaziwet.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9fb9bc34e---xezivokawebupenelatobomu.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/girusadobozuvowukijav.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/0cfe6dc491a3c709b7b579a988edc5b7/13165178736.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877dcd65972---wafigedumanulibaximijatiz.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_off0000e3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F8 10196 bytes
SHA-256: 42a4e4486686c2e1ce8d7947e001bb6826135fbf8ea2668c31ee2acaa4e7bb5a
font_01_sfnt_off0000fad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD9 17836 bytes
SHA-256: d4ea84fdf7650b2d9b5728199c2f0e41f7ba4feddc5e53d5eea27f8bc5722b0b
font_02_sfnt_off00012976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12976 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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