Malicious PDF — malware analysis report

Static analysis result for SHA-256 767c915ecf37661a…

MALICIOUS

PDF

104.6 KB Created: 2021-07-15 11:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9207fe958e98f216d518caf2493379bf SHA-1: 14f949f710f9d4abe1e80f6313f9ba1699858df2 SHA-256: 767c915ecf37661a39713299d8790060baef8f5ba795129cd44d75f1862fc9a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://crewmak.ru/uplcv?utm_term=words+with+ei+long+a+sound PDF link annotation
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//2354374832.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef4958f6c7---kumepunuk.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/2bce5c30eaf857f4a0f52f218cc9dc1b/radaso.pdfIn PDF document text
    • https://parc-hotel.info/file/98343798213.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-8/20210608181334862275.pdfIn PDF document text
    • http://tfforming.ru/d/files/16717741134.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/23d948e5aac0cf37c5dc1c0e9ae7a701/61668140292.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/45656443623.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/43911955689.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/3fc59e8f7a354937a5edaaaaedee9a63/87794078475.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/nbk4vg0nf72ol5ehm840u25tg2/70826577507.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/nisifilobev.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/1678363619.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609299b76a0b1---17719007448.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/kaguwonabedajaveboteso.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/27762954890.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607580ae7223c---lirovupewu.pdfIn PDF document text
    • http://ruresept.ru/files/file/bilavedutokepukude.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/27c9e701b801461123d5dc1bae069915/fezesutikojefujevak.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/17/file/20210617_210022_112.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070ffa1847e3---nifivamixomaribemoluru.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/3205635f6d0da11074263550095964be/56419150204.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/12c04ae10388bb67ad9e41acf1d6443b/xiwovukiwiju.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/25025923268.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/godujojisopuk.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_off0001312b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312B 19632 bytes
SHA-256: e8384a0d4ff31faf60151e9b25d4a340b315f34e5fc2d36a0d8ba2db2e98817d
font_01_sfnt_off00016499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CB0 10704 bytes
SHA-256: 54587462077e3bf83f09e8e81c4d0e5bee7be210434e673c0e8578d7d606d86b

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