Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb74fb5a82048cb…

MALICIOUS

PDF

148.3 KB Created: 2021-07-20 05:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 56e09c608868b5bb48f6a615d62b36d8 SHA-1: 47dd8685cf27692c44b94a2ea30fa40a8edc5bf8 SHA-256: 8cb74fb5a82048cbd7db27cf13e795d68414a45bc62e1f08928a7f75f16c1416
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a large number of external links, many of which point to URLs hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO spam or phishing. No scripts were extracted, and the document body was unreadable binary data, suggesting the malicious functionality is embedded within the PDF structure itself or relies on external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/3d1698b7d70244c25835e38a9992a2aa/46366019615.pdf In PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/demevodoxoxafebimegedu.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0628/744ef9aa8950d40473627935a7861358.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/90784220719.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/24689461908.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/rodamezagufadumasigigev.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/72167848977.pdfIn PDF document text
    • https://efnnma.org/files/file/74910946908.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/86899780680.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071751dcf1d3---34230115393.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16094afd7a4dd6---90051701580.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021522846134445.pdfIn PDF document text
    • http://cga82.com/admin/File/74174754405.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/70e5778c615af209d1a69edfb4af2111/44827679651.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/raposelowopog.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nc9mnsa8pgdei31lumiju0h1k7/koponekidepibikupul.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/jckt4mpa3q5iesorld75dikor6/leriwivebelu.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/7cd74779b602ca4af281826fe2d6388f/67870423156.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/32533705621.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a35f3a94317---xotezopuletove.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210716_8F51AE9629555EB2.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8f5b63962882e8db3a4a7848d80ee41d/88340172567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=taking+cara+babies+bedtime+by+agePDF 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_off0001dfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DFE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001f7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F7FA 19252 bytes
SHA-256: d15a9c6470ae54aef03e2610a6e2f5479edcc494259d776e97a135b08f0bb86f
font_02_sfnt_off00022921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22921 10856 bytes
SHA-256: daf504a3ef915c15b7ab3acdbdd60f0bfb9c20e1d59b68f78dbe4dfe10ae1d94

Open this report in the interactive analyzer, or submit your own file for analysis.