Malicious PDF — malware analysis report

Static analysis result for SHA-256 186c402f687c5768…

MALICIOUS

PDF

83.4 KB Created: 2021-08-09 03:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 09c4986cc4d5a65fbf34de77452adfa0 SHA-1: 449f7c65bdea6d2501debce87588315246b1c7d8 SHA-256: 186c402f687c5768b5e5eb5c3cbebaaa93eef27da52e38d56cb91e12e790c8cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a18a683c337---26381415922.pdf In PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/45042610182.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dd6b9ccc0---40799953889.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f77a1ea0c6980af7863b2f7ab8e207f9/11211361668.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/554ef374d8ba867a324173f2b732b7ed/petagamevidawi.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/sonixebaxojanibabo.pdfIn PDF document text
    • http://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/etme36v20pn90tv6fe7m9hchn3/15993182158.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/vojuwi.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/wesegudatipibezazig.pdfIn PDF document text
    • http://armanetti.com/images/medazoke.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/foximedewekafefonira.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/kelojemiwegubebexagi.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/9ovgeggt1p4sdpedt4eldnung6/77137012173.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/bahhngiopqlpmh7c6ott1nhu21/16077089150.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/17030230355.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccceaed8509---biruvisojubezoxojez.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160766dae44f6d---mexuwo.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/686db30588ba97e15133338469bd93fb/66313734327.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f85c4324a---68469023290.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/70110371849.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/27966982496.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c53b7e2e18f---kapotosenarulawini.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/4ba8o1au6kop3agjik2fha8gf1/nidifokirevowag.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d77b0ff04---72344399191.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/tetuvekabezemepalokov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ixl+math+answers+algebra+2PDF link annotation
    • 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_off0000e194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE194 10740 bytes
SHA-256: f5e8f8128b2e6df1ae0f0c373dc92ab8150955c8c614ae1c646e15e73052c74e
font_01_sfnt_off0000fa35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 17544 bytes
SHA-256: 7306ed417eb33b293c7afe1c1c4f23555a1ce4ff2034493d42a7483e17fa6ae5
font_02_sfnt_off00012815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1