Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d642a6d67e43c07…

MALICIOUS

PDF

86.4 KB Created: 2021-06-27 21:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f36efc46571d673865a076ce341afea SHA-1: d3c8bc24f0dbb6bb6ca9e8b346baca108d64b325 SHA-256: 2d642a6d67e43c0743e41e53a4dde628a4bba8bc97b1edc768dc46b4ceab653f
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to execute the embedded JavaScript, which in turn directs the user to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 https://ketchas.ru/uplcv?utm_term=bts+the+most+beautiful+moment+in+life+part+2+photoshoot
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c1494606f---tuvugiwolisawipigovuvogu.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/lvc0i216uskohebj07n42b57vj/toveluzovexaropeju.pdf
    • http://daieimotors.com/js/upload/files/79001844768.pdf
    • http://partnerplus30.ru/images/fornews/files/gajinawivafinuter.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c582ad25120---63674646828.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/efc9ef3ee5ff512137f8d7e2268c4d1a/50575236763.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/0b0edde9e64fe282de01c8c01d65c7e3/26089134849.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/13136904913.pdf
    • https://nguyenhungstone.com/uploads/image/files/73792512644.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ada1e7d5299---razazobesabavakog.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/kh2mqo1edeo03u5pe7gkq085oh/sunuguwezokipofowemawij.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0b44c0bab---2725881910.pdf
    • http://maasmartcity.com/userfiles/file/gafugoxudaxosevu.pdf
    • http://www.awakohchang.com/image/upload/File/1742945615.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c904574fb---zunezobawekosanalosonaju.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/deguf.pdf
    • http://cjandjunemillerfarm.com/clients/75830/File/vewafulujumis.pdf
    • http://aircond.md/upload_fck/file/16727418824.pdf
    • http://icltindia.in/userfiles/file/76722427350.pdf
    • https://ndmoyun.com/calisma2/files/uploads/29784870802.pdf
    • https://accuratesearch.com/userfiles/file/70459617061.pdf
    • http://eastcoastbiker.de/sites/default/files/file/bogivavoxafun.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086beb533cf2---37520651263.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dce8.bin
db0ecf089d16b67090117a39f7189de1c8d534701d753e294ec1efe6ee552675
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE8 19740 bytes
font_01_sfnt_off00010fc0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC0 16792 bytes
font_02_sfnt_off000127d7.bin
63c1e0c52be8bc71c58a37459faf8e038b2093c2104fb58a9ccd359476b68795
pdf-font-stream PDF embedded font (sfnt) at offset 0x127D7 11036 bytes
font_03_sfnt_off00014124.bin
fe85e0a8a2678545e8e288ad89090fc3bf64d51d8303fb23b502e97109b2793a
pdf-font-stream PDF embedded font (sfnt) at offset 0x14124 1744 bytes