Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9624bc34a4d92de…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 05:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bf176f0cfd2d66de35623e6f80152607 SHA-1: 7ce2efd022eb1c3134af00d218782609fc7d1220 SHA-256: a9624bc34a4d92dee9545056bd77a62aa1a61ff3e9c545675706a81e97fdbd1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple external URLs, some hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The PDF structure and numerous links suggest an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://whatdwellswithin.com/file/16283866583.pdf In PDF document text
    • https://stopserv.ru/files/file/fenepupofutodivewitigavi.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/panun.pdfIn PDF document text
    • http://josquin-capella.de/download/suzudiropamowi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/pjm82gfeadqjtcotmrd4223314/73623990794.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/wikizeg.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786c18bf945---78993555636.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/477fc021d5b5c825f9a6c03f368ac761/nodokajibutu.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/6n6covc6eotnl9grsv8qrkgg5p/35091224251.pdfIn PDF document text
    • http://geodez.com/pliki/file/40368526111.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/90894900949.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/savexogarufebopo.pdfIn PDF document text
    • https://micsys.in/userfiles/file/73143166541.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/xilez.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/9634449673.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/7jggltt91l994t05hiue0kupbl/19832352199.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021051304552273499.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/35708269278.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c3cbac6ec---45780135110.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/tokonuw.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/9719098150.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/voxeneliperibazuka.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/57ffc53083a740bdde66cdadd992da60/18516038777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=autismo+de+alto+rendimiento+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_off0000db2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2C 18656 bytes
SHA-256: 5ee9c69910820f0bd65a7711054dd2b84f924cc8021e9be5f8454bab83421f42
font_01_sfnt_off00010a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7F 10740 bytes
SHA-256: 6eff3bed6a791878f33f5acf73a7afe7f88f7db8fa4dbc94609f3286e40e81ca
font_02_sfnt_off0001232c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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