Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcedccdd178ca7d…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 18:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a760f4c2a8c55c39078cd2969f1531e SHA-1: 3e634c8e769a9cf53fd39ccc020e539f957f21f7 SHA-256: 5bcedccdd178ca7d35f31b0210e252bf4fac65b6e9239ee703c0bd16bc53fa9b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to potentially compromised or disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF link farm indicators strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://jsushibrea.com/uploads/files/49101494855.pdf In PDF document text
    • https://sieuthimaycafe.vn/uploads/file/31085047807.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/mavunawuxid.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161434b9111239---26419947236.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/15483526918.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/06f1a7c5a0224c2f712605741dbde252/24515900994.pdfIn PDF document text
    • http://batistar.fr/userfiles/file/xudofe.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/jiderizuxisanowat.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/499887627.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/80212103607.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/warokobamidudunelup.pdfIn PDF document text
    • https://piataafacerilor.ro/app/webroot/files/userfiles/files/suxigodigujonigemajalawut.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136ff4529110---dolubonidodakeji.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/jufaz.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2509e9902ef92baa1697d4a7f42872d9/xamevit.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/jirotat.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/96640029206.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/15240266051.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/porazatumi.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/63211932668.pdfIn PDF document text
    • https://sanidom.pl/img/file/pusodewesarunoxoviteropes.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/48616950662.pdfIn PDF document text
    • https://kapefashion.com/files/files/vogilokidupoposetedin.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jiguvomi.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/5c637b1a7d320322c4613d7208f73e96/sumuzajo.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/salazot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=track+a+stolen+android+phonePDF 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_off0000da93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AA 10664 bytes
SHA-256: 0bbf75ab7c5de5b1208dfc84cdd658781a7dc48411cebd2ac0a44137dd3691e8
font_02_sfnt_off00010b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 18168 bytes
SHA-256: e24ece29715955fa426a00f84206332989d145f0b622a609cee6a341d0ee6a83