Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa11eaa5d64bfb58…

MALICIOUS

PDF

69.6 KB Created: 2021-09-29 06:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6502cb7b343d9c9d6c7839eb51bb8e61 SHA-1: 6e8dcc50dba648e832f2e7eb4cbc6ad557ccf49b SHA-256: aa11eaa5d64bfb5835bf2982cc100c234a052f406b4602c6db4f2315f907426c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content disguised as legitimate documents. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nessie-vinylcare.com/file/lebevezosarazuja.pdf In PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462081efcbb---37058094166.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/4a73e4f9209509f496ea678ba2b17fd5/foramuxuvapizikefu.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/narujobuvukagi.pdfIn PDF document text
    • http://centromp.it/userfiles/files/mivulifejaranogigixukud.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/zaxejavipudurarovatatigin.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161497dc0f22dc---wigidosukokupalimal.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/k3c7dapaltjpc5gmudj7s66iqc/2092131961.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/62748336328.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/33034561650.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/foguro.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/25002995147.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///tiwapatexojixam.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/19608632854.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/63520756511.pdfIn PDF document text
    • https://thomsonindia.com/userfiles/files/relufiguko.pdfIn PDF document text
    • http://voijin.com/userfiles/files/zuvafoletumexakijewaj.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/sibepiketulevono.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/kakonokoze.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jevux.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/bezifotuzo.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/folorurajidaru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=lehninger+biochemistry+pdf+free+downloadPDF 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_off0000af2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC742 11364 bytes
SHA-256: 4bd599e098ad552e3552dd0480bc805da8b10e1b46b2753a48aeb45f4ebdecd1
font_02_sfnt_off0000e16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16E 15684 bytes
SHA-256: d03fff25d10ec841def7cf894695d71a64dec71877527159faba73d05ee6dbbe

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