Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77b277b6116d367…

MALICIOUS

PDF

87.6 KB Created: 2021-09-05 16:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c70048ccca6e671e68a824419efef4f1 SHA-1: 5c8e4c77ed37b567742394d2e7e42fff96f65306 SHA-256: a77b277b6116d36721a6ca52af3e6db7175563a2a018418fecfbb4bd3ce7af5d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users to malicious sites. Heuristics indicate the presence of link farms pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.asslar.de/downloads/86807150993.pdf In PDF document text
    • http://autobedrijvenindex.nl/images/uploads/kuveda.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d44eb929969---jenaparukisunar.pdfIn PDF document text
    • http://sbairs.com/datas/files/37988542824.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/uqv3avspf8706hq6frdu91c1i8/vesiwelofizilupoj.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/givasaw.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/27611741904.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4fe33e5949318501537a505b224849d5/83806423330.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/85170137521.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/5317811466.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/93690597141.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/mivugodanokugenafabopeso.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/rolotaruvixo.pdfIn PDF document text
    • http://goref.ru/files/file/pareweletugido.pdfIn PDF document text
    • https://akemi.ro/hirek/file/38396910554.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/56313996908.pdfIn PDF document text
    • http://ifap.it/images/file/fukisizofidakifikasak.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/rasigog.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/e4d4cb8b04392bb996f9f795fd1950d1/21671884075.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/14eea062ddb3289981f86d7277523cdd/77044748836.pdfIn PDF document text
    • https://olterus.net/contents/files/62751965836.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160827f4ac6e98---rukexudigefimuduv.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607580e6928ef---25057591051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=gartner+digitalization+pdfPDF 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_off0000ef2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001073d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073D 19268 bytes
SHA-256: 5c7f9a4aaa46093bdad0b94f9f99de376889dd71f55eb8b593ca495c9d4d0417
font_02_sfnt_off0001392f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392F 10604 bytes
SHA-256: 04dd850dade0dc5da7f388dfaa5d92838ff83a83fcddc5dfe11255bf4d9941b3

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