Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b78aa4bcb3ac19d…

MALICIOUS

PDF

85.2 KB Created: 2021-09-08 10:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 127ddb7da3bc00d4aad15f7e2fe2b6d9 SHA-1: 093d8520ee3c8f059905fb9989aa7c1ab9128216 SHA-256: 1b78aa4bcb3ac19d42d1530162e9736a4893cb78f9c68c4ef3605c4eb7449d69
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised websites, forming a link farm. The presence of embedded JavaScript and a high ML classifier score, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malicious redirection attempt. The document body is heavily obfuscated, preventing a clear understanding of its direct lure, but the link farm structure is a common tactic for distributing malware or leading to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/726fdc700788055901f72ed955ebc58d/19392426587.pdf In PDF document text
    • http://altinay-law.com/images/file/jotulumupuroxevosimemejo.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/54429146541.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/8618032881.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/zadukerutomuludemigujep.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/baxizi.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb7dadd142---kujifupegefokuxiroda.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/radikawaxipukufiladoxu.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/53710297217.pdfIn PDF document text
    • http://codefon.hu/js/ckfinder/userfiles/files/26307449586.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f833d99d88569789006e2e6508a1e45b/77968484850.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/sapetuwulakobelimivugijat.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/82825192820.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/30078210492.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080bb50865c2---vinipirebenoziburod.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16078b64e2fe2b---lisivigoneguje.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sipevibefalevabuxomo.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073a6aeedf87---sazunulalevajizu.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/pimutegabanaduxuvek.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/ruletibedukebip.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/wegusufo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=astronomy+today+6th+edition+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_off0000e87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87F 17408 bytes
SHA-256: a9dffa194c5362ce11503909fcdf26049c546a5da7566974cefd59756d77b74d
font_01_sfnt_off00011591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA8 10980 bytes
SHA-256: 69f11d69b3820ee4347853fdf3f24419c78da223506e716bd9c4cd1f8f8fdfff

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