Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b2b3f6cb33f346…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 21:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f640c5c183e6f4fa96c4d8eb02b75ff3 SHA-1: 1313881cadf83afc6f4ad9ec15f08ab24c76a709 SHA-256: e6b2b3f6cb33f3460888e23329b955408e308adb1bda6444ec09416dcf672559
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it may exploit PDF vulnerabilities or lead to further malicious content, potentially involving JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://himalayakebab.irafbrothers.com/shipinc/userfiles/files/gubaziwiwolanedoluk.pdf In PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/sj0apd5d62ovgchti0hvdrpp09/wudelawogibofe.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210522124243044.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/zerilefotuwo.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210622_46BC2F36A0558D60.pdfIn PDF document text
    • https://amblamy.ee/upload/file/wanaxofanajabekoka.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/54285753536.pdfIn PDF document text
    • http://zae.me/datafiles/file/87195530411.pdfIn PDF document text
    • http://centromp.it/userfiles/files/6269064438.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/96910904888.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/b49c65dfdbb6e674789a0d0fda0053c6/pejemufivubadazozufovoba.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/jt6if3qa9gf0nii4lo24sf2152/wanubapibupazufixasi.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/bokunudidudufigixu.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/putogapob.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf6dc9bb0e---5460168088.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/vavisokad.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/1661671435.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609e15112e249---68395531281.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d0bf910bc---57788628756.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/34320844462.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/rawuvorarivuwumurovuf.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/90260643385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=christmastime+is+here+sheet+music+free+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01B 10748 bytes
SHA-256: 2c16d70632772f74380e1cb1870a28b435a9e258a5a0816dd723236597042a81
font_01_sfnt_off0000f8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D7 17252 bytes
SHA-256: ae50076e1a92c039d4d719e39fdb3079ab20239a1fb60dd9bb5145a83a2c0123
font_02_sfnt_off00012580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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