Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f72ba2efcfc0b0…

MALICIOUS

PDF

84.7 KB Created: 2021-07-03 02:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6e5c70cf13ef6f2edc9d8b6f81749b1b SHA-1: 176422678748798db8a79b96ac0e02228b961c67 SHA-256: b7f72ba2efcfc0b01bc92760e488eeaa126dcb8f06c60a65a59b67159d6fe574
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, but the structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=how+to+work+effectively+and+efficiently PDF link annotation
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8a5886eb5---55577138342.pdfIn PDF document text
    • http://darec.sk/files/files/nasurov.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/bomorebozi.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/12310691498.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6de1ralkjqlnu2i2h1s6joatk3/2752329255.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/89983553264.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b791e3642---bukowo.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/docjccvs4tbu9cc9kq9f1vhj5c/zamore.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079958458b67---37504762401.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210701174916.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/92204767950.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a06af59b81b---vipirukep.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/eobb41qd2g46b8in8quugraack/nirezitinuwe.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/kolanemuron.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/cds896lcb6e72vqbefimvgh52e/rugaxiwepidoxijoradubol.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/62993584292.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/kavisexikijivegowetubuzo.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/zevixugutojowise.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9b66d2f0c---88341326375.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/f291539a56dfbf039111053bfe39f338/25978304634.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/tipuvuvagi.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/7027d5f1ce2261b3f888eb0a7d8617e1/67408461818.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/dujizijadinewejuwibot.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_off0000e84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84A 10652 bytes
SHA-256: dd8330a6a77745c56fa066a5d69d1a4c0d2d51f2457a62a0fb13c8f715290288
font_01_sfnt_off000100c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C9 17052 bytes
SHA-256: 2f27684b2b3b69ae99c8f55055c6d0588601a6f6bc1e75545e731db7e606ce1c
font_02_sfnt_off00012d87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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