Malicious PDF — malware analysis report

Static analysis result for SHA-256 12153a90bee64b64…

MALICIOUS

PDF

88.7 KB Created: 2021-08-06 22:38:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd9d5bf4db91fb21395f6f628c4b563d SHA-1: bcce16da6c9c9c4bafdabbd2fa5c8846d3dae505 SHA-256: 12153a90bee64b64c033de1d1e9945a1d24b93f421a56dbf15500a0503cb0880
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Additionally, the document features a link farm pointing to multiple potentially compromised WordPress upload directories and other domains, suggesting an attempt to host or distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://aljazeerahpetroleum.ae/userfiles/files/41791430983.pdf In PDF document text
    • http://elsekmont.eu/userfiles/file/10266447338.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/55837754850.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/c9d611a98a98045e7f6948458c8946e1/96579885391.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/pamujeredososu.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/2464401468.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/4fbf5c0c15ad5b902d30d5d823a5ccfe/menoviwawiniwatotufipo.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac5dc7f88c---17153033650.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/39179155489.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/59092343279.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe259730bbb---45218739085.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/18521196257.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/pikiwijiwaribupupipoxaw.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/gevitituw.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/o7vh48n1lr84171i6m7fkcqeo1/vurutifogudexawoza.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/28937447014.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/gotijoxelojovubis.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b441d1cec6---20684485580.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/le03tl27lfv3olnt25ev16buc4/lirogeleruvagotunirisadu.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7a1561bd3---kafigemokiduvebiraf.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/xewevipe.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43b5b24878---viwizifulonujifesemo.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/2c7er81fdib18c1al1bl2b2eo9/puzekiwezoduderi.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/27/file/35897357693.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/e562b49e99480dd58d34729a1d3967cd/vunorixiji.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cede90f837---visurosikiravudafizegivub.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/dogizalusizuto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+i+connect+my+iphone+to+my+wireless+brother+printerPDF 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_off0000f42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42E 17800 bytes
SHA-256: b4ac12e5c8fda178fd24aa7fc5a5b46e89003101fd4b68d5030b23385dfddb1b
font_01_sfnt_off0001226a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A81 10948 bytes
SHA-256: 4dff219a15651471ec3d9573b9e688c1932d76b36895d494d6b1765becf13faa

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