Malicious PDF — malware analysis report

Static analysis result for SHA-256 481123e685656d1b…

MALICIOUS

PDF

153.1 KB Created: 2021-08-10 02:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c98e0fc4fa023aa2fab15aa58dd89cda SHA-1: bd5732b8b7106ef18275243edad58909d78314a1 SHA-256: 481123e685656d1b4dd0c8d5c6d3305d46e42b725e00a0a98b8d61a2e70110aa
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and the nature of the link farm point towards a tactic of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9661

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://kondicionery-ivanteevka.ru/upload_picture/file/gepeje.pdf In PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb889642bd---fikuxi.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/tlu9bt77v7gur0j6u6al00b16h/56393444082.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/1476206c353940644ac8d0043083f44b/45694199285.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5905b335a6---jerexawowaxesu.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/doxaguweditewire.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/t4esa2ph3g5n4e774dqai1d7t0/tetabirirufefabul.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/luwofapoliwibigufukara.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a56908dda---letidi.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8bc7bc194---vetutoli.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/rozeduredisudabobu.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607df94b63bb4---pevolesirotuvubobixaretub.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/91085457095.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b49032fac9---23995830956.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b84787353d---zanutizasavapi.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/bobuwep.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/9001536214.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/2rvnjoa7ie73ontgnb3bl6r19p/kulutebemusoget.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607195f62bb89---fupatiwebinafibe.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/be52561916a70dc47c87873585bb01f8/geluzevitelor.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/jbo2182qipi7qjtu5io4k8h9mg/vurud.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607419f41b477---lulugipominajese.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/widusatal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=roadrunner+app+foodpanda+rider+iosPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12241 96772 bytes
SHA-256: d6d136610a882c9f1fa507086e8dc3c4045225152793e8bf07d422e95db40db7
font_02_sfnt_off00020fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20FEF 17176 bytes
SHA-256: 99f34911c15a6f6be6cdff9b8694e678b01529ef1dfce85020b2f7535d0749b3
font_03_sfnt_off00023cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23CF7 10492 bytes
SHA-256: d08cd237bd9635b2f0bccfdeecc95bb14aaa8de8cceda8cafed3dda6a54c3436

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