Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7138c41b7815175…

MALICIOUS

PDF

78.0 KB Created: 2021-07-08 23:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22e35952ea192de7aad75d455a1d59f9 SHA-1: e6e644264bf1b9d1489fb616c5d47b1e871c48ff SHA-256: e7138c41b781517510c84be375896a0a70fd6dc87ce36cd67c29daf8e8a15d08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://transinfosoft.com/userfiles/file/rusavalegamatagib.pdf
    • https://landbondcorten.com/attachment/file/822f2369630b28b1e4b6ce5fabe14965.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/iujgvdiasi9h06salat7h6g254/pudiwodowupu.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/iactp5l1bud9ssmi5ugt1mjch4/5184344002.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/lds7gp5pia4k0u16serra0g0ab/wanuzujogabano.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4213b4bd8---36955450325.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c19beac345e---fozoto.pdf
    • http://snsi.jp/image/news_file/41891253570.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ac236b268---66791133398.pdf
    • http://cokhiminhhien.com/media/ftp/file/7579872825.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9fd1adec3---nazugefalixapiso.pdf
    • https://aterhesseg.com/up_image/file/25010984113.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/7e8249de8a6b3f713383601426627111/lidofofuzenofovamixize.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6703afb64---87384602387.pdf
    • https://sonntag-immobilien.lu/userfiles/files/54399777238.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608da4b31b908---55872739391.pdf
    • http://arcenevents.nl/site/upload/files/kobapuvagetiken.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/56053b0592af3b2e5c90ca637433818f/getikisijezi.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607bef3e6f851---48429972838.pdf
    • http://zovsh.com/Uploadfiles/files/59652164996.pdf
    • http://chia4kids.ru/ckfinder/userfiles/files/fawomid.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f72b5b40c6---rojab.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e1826effb4ac9724642ac785ee95e2fc/zaxusuwumavofolokotafoj.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/nsm3ko9hhjpvk9aigj92manjs7/80379944494.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b08d3575cc---52402426864.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759201e194b---36313427943.pdf
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/kawirikisekititufaxa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=reading+comprehension+elementary
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf0c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0C 16792 bytes
font_01_sfnt_off0000e723.bin
b18f839d9d17f712e813092050f96989fb06a529814bf01c47582be12d535765
pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 11120 bytes
font_02_sfnt_off000100a9.bin
e27d2b670272d5f1572f6aa684905aa593926570cc6278d034349e2aaaf05719
pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 16168 bytes