Malicious PDF — malware analysis report

Static analysis result for SHA-256 52475833f3afc65e…

MALICIOUS

PDF

72.6 KB Created: 2021-07-18 14:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fb093001001c3c6d9f15abe4b3342e98 SHA-1: afc36f6220d1ad5fd7ca9cfdd4fce163453e670f SHA-256: 52475833f3afc65efb2c8954215e6a53d32630e527d2a5d8578b7770e06d4ed8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains a large number of external links, many pointing to PDFs hosted on compromised WordPress sites and disposable domains. This suggests a link farm designed to either poison search results or lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://3bbb.fr/ckeditor/upload/files/70302363378.pdf In PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716c3a41403---1808970455.pdfIn PDF document text
    • http://gerocuki.hu/user/file/2914720486.pdfIn PDF document text
    • http://teknis.it/userfiles/files/depowulujuwawoga.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/cb6479c9cb55f5aaaacacb4abb72a04c/lebezejoginegubosix.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/zoguzuko.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/23f8ed9b26cd46d238b942fcae6f9e0b/dedofipinojatuvixafemok.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085992d4644e---65899040312.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4089e304bd---49467678114.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/h6dtq5ruuruo6bas4k46a9sbm5/26817726564.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021062716141262.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/tidoje.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607974e4773b9---maben.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f70adab92---sebuletewip.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/togetelikonobonotebapeka.pdfIn PDF document text
    • http://btfa.tw/upload/files/jafumopexasutamuwudisa.pdfIn PDF document text
    • http://robinsonsmithreunion.com/clients/879094/File/24280837580.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/gg2msnbl9eq5m3ca7l22h39vl6/fexokal.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/36faeea24ac412461f76373904e9fca9/pawad.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/53870751716.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/kugufekofudurajoza.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/vijimokipepidokugujapole.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/joxurid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=tubby%27s+east+jeffersonPDF 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_off0000ba9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9E 10552 bytes
SHA-256: bb16718d320654f380057f6cf6987c0762e5b654030bda80f9e5160e1277d1b6
font_01_sfnt_off0000d2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB09 16440 bytes
SHA-256: 761796c5d02f498459ea911822c1ca4b0450544f19db9212839464ff4510cd1a

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