Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5dc324e6b511328…

MALICIOUS

PDF

92.4 KB Created: 2021-09-21 08:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4d860a8e05501bc8e62f41d0a7d50af8 SHA-1: b4a3c201c376f84bee3aea1a7e0e393fd8668428 SHA-256: b5dc324e6b511328af6f7f883c86b1a7d50455acea295ecaa47c10d0932a839f
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable domains. The primary attack pattern involves directing users to external malicious sites, likely for phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://yachtales.net/admin/userfiles/files/mamofezinoxez.pdf In PDF document text
    • http://king-pro.com/userfiles/files/zuvagixa.pdfIn PDF document text
    • http://jubangh.com/Upload/FckUpload/20210918file///32731429788.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/28901860706.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ac0f36e5a---nujoxiwiviwajulerek.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/wofafijalebudipuso.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/pumulunadexinibagiga.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161468f4250bcf---bafiraradodarus.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a775e759c---jokitik.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/vipevuzik.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/vekagamugutateneb.pdfIn PDF document text
    • http://hingliltd.com/userfiles/fodafuper.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/8358976491.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/09d9b7bb18c8c92aa02b9acf05ada292/43176420727.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/dijixuzaxaki.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/mijurixoduvegew.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/56312562180.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/64405333661.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/p25q77gm9mlthpehokjbcrhhi1/32010053403.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab1a5b2a92---madukonutilo.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/92856662066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=destination+b2+grammar+and+vocabulary+with+answer+key+pdfPDF 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_off0000dcd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD9 11788 bytes
SHA-256: a7ab37be4a07a0d99a2dc0e79c7ac9a192eb2ee340ca0f51f512cdcd06750167
font_01_sfnt_off0000f896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 23844 bytes
SHA-256: 1a87c540496fb886b9277e8a422dec0697d00495a703208bbb303f638643ac6a
font_02_sfnt_off000135b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B4 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137
font_03_sfnt_off00014b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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