Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae538c88423bfc3…

MALICIOUS

PDF

83.4 KB Created: 2021-08-15 12:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7674ac1dbe466753c50ebd2808950174 SHA-1: dd6001e4c5395d114554a41696e44c6a92484b7b SHA-256: 7ae538c88423bfc335ff1579b303a99b2d83739c4322e97dd5c54f5d460fa875
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous links suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://juniorclublivorno.com/sitonews/images_upload/files/16492930389.pdf In PDF document text
    • http://abwmountvernon.com/uploads/files/xizoxejofovopogakupemirub.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/250202340b24c6434c48ebbe13abf90d/36882929442.pdfIn PDF document text
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/sepuritomomuwojukuwejepo.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/wakironowufona.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/xabugovekawuvoge.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b73071ce3---teboxokagajum.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7a1f4202ca4a81b79c8703a2a2624812/widufis.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7b984e52c---todig.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086458ceba25---zusutaden.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/kaxolez.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/30336115353.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/6530vvnjul31sp4m0qqdlfs6rq/tadavikopiked.pdfIn PDF document text
    • http://kaies.cn/upfiles/2107310702072569789ac8gx.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/nukuzo.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/71180204740.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/wejovita.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/107a1ac5db8462f84cd54f80a12993c9/59087677267.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/95625299487.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/fovegikek.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/xuxadawif.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160804694d6ad1---dogitokojeme.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/72991875028.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fb4eb25777b---91110981896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=como+fazer+pedra+no+little+alchemy+2PDF 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_off0000dd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4F 11044 bytes
SHA-256: aade871fe49e62e9727ba4cb1343175cb7858786d388991d4e4bfabc5be92910
font_01_sfnt_off0000f6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF6 19164 bytes
SHA-256: 2f04df5e3efae5e29fa928ffdd8115892080bc61611b0e2e0c068cdddc44029f