Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d825b9998050bed…

MALICIOUS

PDF

84.2 KB Created: 2021-06-28 10:02:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f17767d2e2c7e69bbf1be2aa4fb573bd SHA-1: 01c1b62dac930568f6dee7086cd725abfaa9e5f2 SHA-256: 5d825b9998050bedc681fa6294fe3671ccc9bfc86f80e93174d5ecd739e5c9ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The presence of multiple distinct hosts and link farms suggests an effort to distribute malicious content across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096063f85685---datufazebuxudazefo.pdf
    • http://hotararicedo.ro/files/files/noxavofapadoxigo.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080416fd1495---nafaxituwunuzime.pdf
    • https://argumentua.com/i/file/69995656094.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69e0b6aad3---68758223394.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a5278b000---rabakogabugedote.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/02a125c57d876ff35494d5530a8257c8/51544745679.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099d614a7af5---56132535766.pdf
    • http://augustaelectricalwork.com/editorData/file/79548042658.pdf
    • http://therealmccoyfamilyreunion.com/clients/f/f9/f9ea119420dddc0cc5ac7622830b9f68/File/bosiriwox.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/1701925eaaac392e1f816b197bb43e9b/pezufulumaxapisufipopeku.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/24476136542.pdf
    • http://jfkanacon.org/data/userfiles/files/xuwakojo.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c03df0425---tomevab.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2427fa39bd---vegutazojikolipe.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a039cf1f94---70979980482.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fe8d04059---roregesalulolumobodut.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/iqbvddad02a9vv0stpie6ts3gr/jiloxolowajekejukukomelum.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160837e00a44e6---jifebixafimap.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/vhm835ap7rjvpgrk8e2njbf8ac/zovux.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/8lu4gk9172dcrf18p5eqek6jt6/filitevokijureva.pdf
    • http://stalmost.pl/userfiles/file/5754842055.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+make+a+advertisement+script
    • 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_off0000e371.bin
a524b38c2cf7a4b033937838e5a647880fc030982140a73d7026b3eea6fead77
pdf-font-stream PDF embedded font (sfnt) at offset 0xE371 10864 bytes
font_01_sfnt_off0000fc8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8E 16792 bytes
font_02_sfnt_off000114a0.bin
8cf15f74666ccfa12f0a4759512217ca5bd520f94d2f02665efed0d0089eca17
pdf-font-stream PDF embedded font (sfnt) at offset 0x114A0 17988 bytes