Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf54655afef6237…

MALICIOUS

PDF

69.1 KB Created: 2021-09-23 23:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa0426e190339fbb9907ed655e8980e7 SHA-1: 9b780a6eab959883265e291f99541010fd6bf595 SHA-256: abf54655afef623717bd4f8d36913827bd081a5069ff80d98e191245dc178a34
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points to an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=mod+menu+apk PDF link annotation
    • http://abwcockeysville.com/uploads/files/fulirigiparotudureduwerej.pdfIn PDF document text
    • https://brs.jo/userfiles/files/90565205705.pdfIn PDF document text
    • https://frenstravel.com/assets/ckfinder/userfiles/files/jaxuvokulapukenopijas.pdfIn PDF document text
    • http://www.moyekolodin.com/files/11643864295.pdfIn PDF document text
    • http://rjt1.org/upload/files/3797718175.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/xenezusodozujedubu.pdfIn PDF document text
    • https://afma.pt/site/upload/file/43967817734.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/sitegimob.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/19540111650.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137954995221---lapezametix.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/zugaroz.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/52579292197.pdfIn PDF document text
    • https://yuktogel.com/contents/files/xamasekewipifizevigagar.pdfIn PDF document text
    • http://hcm-invoice.vn/hinhanh_fckeditor/file/gitosuperekegiv.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/2a616bc38c55268436ad60f3e63ca6d4/54938700677.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/c1270thmcetb8ttiuk3obf805j/96327735382.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/tomopawukasexes.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1023b5d4c---59306474189.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613b33a77ff82---budeginesameb.pdfIn PDF document text
    • http://budropol.de/Upload/file/8081933204.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/45701541675.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/80463770744.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/24165142974.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/9712633259.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_off0000b060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB060 15988 bytes
SHA-256: 25cd64c4b530cb6d0397a98e6fe0d7240e910b657594dc8bbc949110706ff9d4
font_01_sfnt_off0000d874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD874 10236 bytes
SHA-256: aa1fb07824cbf7502b816102b99bb821b8010b36a04768da597b1b99d04a5178
font_02_sfnt_off0000ef5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1