Malicious PDF — malware analysis report

Static analysis result for SHA-256 281b45757a90a8d0…

MALICIOUS

PDF

86.3 KB Created: 2021-09-06 23:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 50aa7950246eb19af628b0d7adaa1975 SHA-1: 2f98fabf7ad1e65fd8cdef99a652db9b18678bf2 SHA-256: 281b45757a90a8d0e462b7471d202ee7bd2899b532657da05db2c2e18b1774c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an embedded JavaScript stream and numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a downloader or part of a phishing campaign. The embedded JavaScript likely facilitates the download and execution of a second-stage payload from one of the provided URLs.

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 https://archism.ru/uplcv?utm_term=the+farlex+grammar+book+pdf+download PDF link annotation
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099be7aebdf7---98027388814.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/63520847947.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/68680246503.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2aad2b286---25353550267.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607690fea7e75---bodikovanajobubazisalow.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/6or75915kugucri2faav5s6ng1/53502523016.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf13ef10f5c---14006274512.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/vofaporo.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/sajise.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082831d61fea---momofevagawusa.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/mulf9nlj44mvk2qmp64epson87/vivurotiguxaxexinavafejo.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/kikobovivemogesijure.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/78831053050.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/noxadawotixofatizabaz.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/70515130947.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/muforija.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/opafawodefileti.pdfIn PDF document text
    • http://njboyuanchem.com/upload/files/82356672346.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/a2a823c2ecb49e2314c6f8b5ede24ee0/vebapomugaxoti.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d9220543737---42086507618.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/65314799976.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/61699887358.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/9287509c7a29dcdb7aa796b6cb4a5609/xifuxoze.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/lodivolodinuku.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_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 10968 bytes
SHA-256: 48674318c2685145642fe4dfc99d170faf78e6d99afc09376ea25c1c31e71386
font_01_sfnt_off0001052d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052D 17796 bytes
SHA-256: c375601f22c03b77a29c8b2c33a11b46707d5fb22013350022206ee038eb7ee0
font_02_sfnt_off000132f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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