Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a010356285d93d3…

MALICIOUS

PDF

87.5 KB Created: 2021-09-13 07:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6644a45eef2ad0ba8ea4979f1e0619da SHA-1: 00e6e723976c5a7870522d080dc116b615c98b3c SHA-256: 1a010356285d93d31228f50ced7093dea47eab403d6458aca0580d9169db6cc6
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The embedded URLs, while numerous, are primarily used to obscure the malicious intent of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://exima.kr/userData/board/file/7237667782.pdf In PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb78c04b8c---41682985207.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161370eb49cdec---77026341689.pdfIn PDF document text
    • https://bnovum.hu/downloads/dozemusebax.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/71312771688.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613db98d9c1bc---lolakabadijapudaxig.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/43980321309.pdfIn PDF document text
    • http://sieuthibds.net/images/files/gikevozomerifavagepulupon.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/rabepew.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/ropagitagekuwisifanelejam.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/bijikapikivoguxorapusem.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/7938044356137cff633dd6.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/87584573137.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/miforugevi.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/lijodutokuwekar.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/39249901026.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/xanirigutelisafulipiwuraz.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/weporigitalo.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/kaxanozerawolokipafol.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/28890545038.pdfIn PDF document text
    • http://holzbau-napetschnig.at/3281125670.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210902_035155.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091100452334948.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/webumuragizozena.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/40537139175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=material+design+2+uiPDF 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_off0000f080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF080 18072 bytes
SHA-256: b1bef42393c9d7a331d7ff63b0c84ecce42db56df768674e79686fda5971c7dc
font_01_sfnt_off00011fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCC 10516 bytes
SHA-256: 7000857f7c8cc4e3e66d149c9dcf8b35bc2eec6a762b45a6e89022351804533c
font_02_sfnt_off000137af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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