Malicious PDF — malware analysis report

Static analysis result for SHA-256 418f949e83eeb849…

MALICIOUS

PDF

84.2 KB Created: 2021-09-08 07:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 88d1522d07230101d9267bab266c6780 SHA-1: 6d0d6bf6fa56b21887d83cac1a36a122abaeb3d6 SHA-256: 418f949e83eeb849b7edc7f93b277dcce15542bcd7b298a4d64e7e7d14b60214
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

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 https://nomylo.ru/uplcv?utm_term=commercial+pilot+training+syllabus+pdf PDF link annotation
    • https://ikima.fr/uploads/file/sejoziw.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///93343389626.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6134796b6---78076356739.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304a8027133---datebaxukal.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e539bd87c---44504585590.pdfIn PDF document text
    • http://jaht.com/userfiles/file/kuxibirin.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/48786771580.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55d337208---bejos.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/33521153042.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5439534a76---fudukatijezozisasitirili.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/402c654164d86a4b9333d58d6047341d/betesowisapoxo.pdfIn PDF document text
    • http://gibisch.org/files/files/xebeninura.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/vesujitivulabiputabat.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/wemawadubadobawani.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/vewenumoliti.pdfIn PDF document text
    • http://vce34.ru/attachments/file/pepaguxuraxuzugenesewa.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/59395321375.pdfIn PDF document text
    • http://kotolantopeni.cz/file/96916684154.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/93526331560.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/nabokonanezelepazosaliwox.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/89402550587.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b0d5e35a8---lapalivunamezixunokuzare.pdfIn PDF document text
    • 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_off0000e36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36C 11348 bytes
SHA-256: 3d84f026445ec0ba77cbd834c320809fcf72d4fabee2bac203e766e8c03d22c8
font_01_sfnt_off0000fdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB6 17576 bytes
SHA-256: bcb159be290142c36da3875288fdcdd6ff6d2a02937b181208269d588daeec2a
font_02_sfnt_off00012b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1