Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9b992edc8d035c…

MALICIOUS

PDF

85.4 KB Created: 2021-09-23 18:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b58eab84639d8905d22cb890cda85f91 SHA-1: 416d2008395c3481eaa9096611b779dcf34fd03e SHA-256: 3c9b992edc8d035c48b34f4e3394d5e1955f50388ef3e233a3b3e6ee8bc55b61
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits PDF vulnerabilities or contains malicious content. The embedded URLs point to compromised CMS upload directories and link farms on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the URLs and the PDF format suggest potential exploitation or redirection to a malicious payload.

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 https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/2p26i5eq9j81jjq9lbibqs7398/pediwozakatapetakemipawe.pdf In PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/50686025023.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/85590693666.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd0a0a66c7---13796460987.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/72557215393.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/a64607beb6be8a0be7a00b57d1c0efef/biminip.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/vugepuvogerejotoz.pdfIn PDF document text
    • http://snft.ro/media/file/48309915580.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/rumizifugujavexobarelazi.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/54015321900.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/rajijaravulobesefedosen.pdfIn PDF document text
    • http://kite-surf.sk/files/8773858608.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/gobivigino.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/64884937239.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109071251163705.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/vurexisebelewud.pdfIn PDF document text
    • http://nature-revive.org/files/file/77988201972.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/biwev.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/24097227392.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/sovizinus.pdfIn PDF document text
    • https://mimpishio.com/contents/files/63377140386.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/60168398386.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/86996512827.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/vosuzizotiwapozi.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/79382651332.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=new+gi+joe+moviePDF 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_off0000e97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10193 10032 bytes
SHA-256: bdbd0a9b8a4226200b09dce42befdf8c7b0529c81d994894b9ac97b4c2e9711f
font_02_sfnt_off000117da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DA 18540 bytes
SHA-256: 6b9a3da5f2ebe27d8effb14b4d35dbd3b13bf033ce3c8a2ecbb4a7aa23cad08c

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