Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b6168f71c5ee81…

MALICIOUS

PDF

102.1 KB Created: 2021-07-16 16:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3b354fb4c5ec36a949b01f6638dec8a9 SHA-1: 6967b3af7b2a09ab0737b906d682d2bec0a0d5b9 SHA-256: f3b6168f71c5ee81863c7d29fcdb598a97221da5dee5bcf166c2624635f346ec
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://coonvalleycc.com/userfiles/file/tetizuruwakuge.pdf In PDF document text
    • http://dgjst.com/upfile/file/luzowowelijir.pdfIn PDF document text
    • http://wirheiraten.de/images/file/dutetusajegesagi.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/7f05e9d9860114c35d7427af99d23125/waduverekologerenuxifar.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/dakenawulijijerubogat.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/32a61ea865bcab8df52811366e678d55/penibepogofijew.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/90692563544.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/57830425523.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/1c4858c86e9ba2b53e39283d8e08df6d/76204984001.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/suvigabojafab.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/watefofonibunifunezawa.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39ee3027d4---52971854906.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbee27bbe4---wubefupapoxas.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/26762944425.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/60985426335.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/b8087df08233ecbd14e74b6b56d989a6/20516853127.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/vubanuwive.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160eca42491cf2---97373212206.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/vupikixad.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/xagavi.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/67590792506.pdfIn PDF document text
    • http://chetaomaynganhnhua.com/uploads/files/31190353053.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/8e49760247283dd30b09d975c94030a4/5382359966.pdfIn PDF document text
    • http://www.heksan.com.pl/file/bafomutugodub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=section+32+2+review+invertebrates+and+vertebrates+answersPDF 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_off000126c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C0 18736 bytes
SHA-256: 2f60cf91beb1d2e9623d89f804ad8ccd8f2095f482fc1f6e424c36dafb8944ac
font_01_sfnt_off00015716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15716 10976 bytes
SHA-256: 73e5a54a5d68b20944b05467928d16ae3c799222e88d0b603e3612c9523e490f
font_02_sfnt_off000170d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1