Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3562a53635337c…

MALICIOUS

PDF

86.8 KB Created: 2021-07-01 13:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f2699f7ca1cbc0acba8625f69447eda SHA-1: 25c83509bafde9bbfa48ca04839a494993ff54d4 SHA-256: da3562a53635337c9048b42e0c6a7409b4664d3bf59db56258b19e7e3e3ca9b0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the structure and URL analysis suggest a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • 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.
  • 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://ipmarketing.net/userfiles/file/12345090715.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084a86365b0f---51023649705.pdf
    • https://nanyangtextile.com/userfiles/file/wanogaderugenamot.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd1a72028---47538813273.pdf
    • http://www.urbanwaterways.info/files/tewagalobu.pdf
    • http://0851gay.org/userfiles/202106file/2021061406190670554.pdf
    • http://whitefamilyreunion2020.org/clients/4/4c/4c64578d40ee165aaf486c9a1ef3309b/File/makokogemexam.pdf
    • https://dolcezzecaffe.it/file/goxaranivefotofozej.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/71adf3c9b0e0997d71195d3756396944/55604616126.pdf
    • http://grafichesirio.com/userfiles/files/bajixutifulevupoponefofe.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/8bec81c1642ca5e6edd99580ab5c98d1/nizuvuxorijikotusoxu.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/4ggatg4aot7slto399p0hs4d4j/rolejorowafa.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/a26779217abf63f8fdf36854cad8583b/2696171540.pdf
    • http://efuegypt.org/userfiles/file/91553885885.pdf
    • https://ipic.vn/userfiles/file/budefogusuxunuz.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16091e1165d738---787349801.pdf
    • https://pearproperties.in/userfiles/file/wuviwixuxanufunotoguw.pdf
    • http://sweetbasketsbyjackie.com/clients/864293/File/nibopuzizowugij.pdf
    • https://kawanmto.net/contents//files/sibalidafafejerep.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16071d66ef3e0b---40842401284.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/3c14bf3033ddeac52008ab7e1a34294a/34730505327.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/780k1es87edlfaj8tisqfegnq0/2257458968.pdf
    • http://didula.com/img/file/xukuxevujasurisesumagofa.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16081fc5c7c091---37533186.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acc3192bc4---94281093822.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/6cf1b66442e58970a3aae47b89fe6715/vazasitowagatolewabap.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=gift+wrap+with+newspaper
    • 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_off0000f059.bin
8224ca45c4ef32e6af5ee9d8cf68ae5d95818ddef50c6345e3a993bf7f436134
pdf-font-stream PDF embedded font (sfnt) at offset 0xF059 17620 bytes
font_01_sfnt_off00011e37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E37 16792 bytes
font_02_sfnt_off0001364e.bin
43b1a0fe1b16404730a61088556a046c62f75b350f12947906a819bd7fe33b1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1364E 10416 bytes