Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f44671a6665c88f…

MALICIOUS

PDF

85.8 KB Created: 2021-07-24 00:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 83f0955a00e3ee41fa5330294b237b73 SHA-1: 19b62ac1479419d1b5b0667279e9b1351b62a0e1 SHA-256: 4f44671a6665c88f8cb08ecda2deb565eccfc8480258a4d1ad0d710812a4088d
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of multiple external URIs, including those hosted on compromised CMS uploads and disposable hosting, indicates a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://bimetoor.com/basefile/bimetoorir/files/soleviludinofolesosi.pdf In PDF document text
    • http://spielundlicht.de/content_provider/documents/files/sumaxisudagevinut.pdfIn PDF document text
    • https://signika.pl/Upload/file/44622125885.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/13pqgmg49f1qpb5dasgvi98i53/91019671128.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/4156674554.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/6875911179.pdfIn PDF document text
    • http://centromp.it/userfiles/files/bosarikokometiz.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/2e432e9c0755111431102a57c19cb626/42841366975.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/ravezoz.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab3c8b0d9c---wixisepodomumo.pdfIn PDF document text
    • http://planbmedia.hu/files/27665357995.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/8837944299.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/70413075847.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/rc4755coffh89h6l8m3skqlpne/sobafofup.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/tls8ebu8g8du03tl5fmfh2ntc7/perolagobiwividipero.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/63532603530.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/48189479005.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/27cfd1ae4eefa97f5cdea6118d239f02/75895111981.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42806679598.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/12494446571.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/taripixixosaf.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/68bcc7fgu2echsuoge0m7aj2a3/fakozusimuwemokape.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/89087089424.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/qrqnncl9rs46skue4or9kcdna1/keguxose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=future+perfect+tense+exercises+for+class+7PDF 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_off0000ec71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10483 16688 bytes
SHA-256: 267d02c254e76b26e7376f363e1bce38efb107af49ebefa9bd51d05125968113
font_02_sfnt_off00012f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8A 10704 bytes
SHA-256: 8a52ef3bac6514cac1aef1395b1ae7fd2b17f2354b62ff2cfd0bc9d7cc7f2677