Malicious PDF — malware analysis report

Static analysis result for SHA-256 b70c4ff82e142ac3…

MALICIOUS

PDF

79.6 KB Created: 2021-09-22 20:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: abfb2b1dec293a5e8fd7572456129962 SHA-1: 4f49cbf18bf9a9e026fbb7e031b6f41a1ec83116 SHA-256: b70c4ff82e142ac354cee68f39dc20b1978aa82cc6e12cafe9ee5053eafa96da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF contains embedded JavaScript and multiple links pointing to compromised WordPress sites, suggesting an attempt to deliver a malicious payload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a tactic of using compromised infrastructure for hosting. The ML classifier and ClamAV detection strongly support the malicious nature of this file, likely used in a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1f2f27944---21960316800.pdf In PDF document text
    • http://nepalbestcargo.com/userfiles/file/manasilavaro.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/jiluburaluvovumofufadas.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/xebimipibebu.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/83824476290.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-15/20210915172028923686.pdfIn PDF document text
    • http://nova-auto.com/upload/ruvikovozolu.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420a1595ca9---48857309934.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/kirixobipolurerogogorago.pdfIn PDF document text
    • http://chinahongji.com/d/files/wapukite.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/73609131588.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109080300598567.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/kapitopatupezodix.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/41048931625.pdfIn PDF document text
    • http://sooclose.eu/upload/File/sufanivinilevewonuveg.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/pebujemukuvatejotikiram.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/78752921631.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/17799636234.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/xaweriwepebewibaxitijipaz.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/mujukegidevanugibodigufi.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/69010983651.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/nobumufimik.pdfIn PDF document text
    • https://junona.manyel.website/images/uploads/medium/74789492039.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b19ce71191---pokokizekiripoxizikal.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109081353311421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=delivery+report+message+androidPDF 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_off0000d2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB04 17052 bytes
SHA-256: 15f2c7400a759bdc8dda57e013b2917be1770bdcec803a074f5641c2ab5cabe0
font_02_sfnt_off000117b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B3 10916 bytes
SHA-256: a70996308105eeca59129cf77339d491aefb1942201f6cc3e926c6ae61f64811

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