Malicious PDF — malware analysis report

Static analysis result for SHA-256 3375d6000e234201…

MALICIOUS

PDF

77.4 KB Created: 2021-09-10 00:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7c3ebad22f2bd10891faa65482177fb3 SHA-1: b5bfd07e02aaa4c90d35f44548691c43b423aedf SHA-256: 3375d6000e234201fe883477f7403ecb36fc9062fb786675c6c4a897ebc77c06
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits a vulnerability to execute code. The presence of numerous links pointing to compromised CMS upload storage and disposable hosting suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://autoscuolavalerio.it/userfiles/files/70246439759.pdf In PDF document text
    • https://orangcar.com/app/webroot/upload/files/75027062516.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f99d66263---rejapubelorutoninutov.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/67543268658.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fae45aae4---wuvuwusurilasari.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315c2c27ef1---nuxes.pdfIn PDF document text
    • https://hoalavender.net/upload/files/62805709171.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/50681493194.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210905034503.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6aba25b1a---pipafesetozo.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/luzozexuforevuzofuluga.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/5479829977.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/nitejumawubivugogu.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/85920226228.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/97854826257.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/roteputejegelelunixu.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/52435103361.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/76449025901.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/tifivalefazepavexi.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/vetagozizake.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/37485027083.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/5418348031.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdcf74834b---32307168179.pdfIn PDF document text
    • http://e-menu.hu/editor_up/zomaxopode.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/bimejunuwosumaliji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=scert+9th+physics+notesPDF 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_off0000ca8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8F 17564 bytes
SHA-256: 3f3523d18ef295ceb12ef771301736c936c8c7e57e88c3eb726631f4bdcbdf14
font_01_sfnt_off0000f83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11056 10620 bytes
SHA-256: f104169ee095c96e2b4ad68f0d65946b102015efbe24ad863c953afa8ee24ce1

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