Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d92cd1f78810d4…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 09:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 040d8606939b04b32e69cd526476059a SHA-1: 43ad5b4bcc5cdbc41a7e751cb316962c2b324488 SHA-256: b9d92cd1f78810d4811a4354f62d0c84058cf32fa55282ef23230abfea8997e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted, but the structure suggests it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://murito.fr/ckfinder/userfiles/files/kuzidokijibemotiw.pdf In PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf08bcea1f1---govusatakijuwu.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c0adbb9aec1---28744393807.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621356353.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6f1433f518cd7193e6a69ffb4bf39d3e/wigifa.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6ba9dea27---zaribozu.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/12692300195.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/09740b0095fa4d5de567c324fc49b032/66680333992.pdfIn PDF document text
    • https://premiersuli.hu/files/files/todogazuborew.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/mojapamitofafesasi.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/99669394251.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082eeb4949a2---poninibobi.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bf294d2c0---dajejiwibutunonebagaj.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021083012521794.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c25db6bf55---45177991959.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/xalomo.pdfIn PDF document text
    • http://tiyuchangdi.com/upload_files/files/20210708_141717.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/34334668358.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/xobelir.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/m5ap7ob5ttgr2osepj4th3p0ej/misutifibelo.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/sunavoguzi.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0ffb43163---6099534222.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/13145834741.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/0ahm9g6uja6dsvc4qqh3kn2fo0/7787374296.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ad7f28fc13d713f487233087d805ea9c/13495787877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=townhall+9+basePDF 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_off0000e72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3E 17340 bytes
SHA-256: acd56e832827ba5474366e260e90c7836f0a156daefd78249510a984b4e712fc
font_02_sfnt_off00012c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C0E 10272 bytes
SHA-256: e1b47ee9e04196d2dfb39fa374a4249aca1e57c3739aa6efbf63e8d18e64447f