Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecffc0ee6380cc71…

MALICIOUS

PDF

69.5 KB Created: 2021-09-29 13:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3f1e5f09a78d7001787fbf7e7fd12ade SHA-1: 96addd054097481cfe711e553dec4fc4072945ce SHA-256: ecffc0ee6380cc717dc1b350bf4cb3e3044c95ce48538f8fc724c56168780b0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous external URIs, including links hosted on compromised CMS uploads and disposable domains, indicates a link farm designed to redirect users. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://hondamienbac.vn/userfiles/file/21313640709.pdf In PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/55272743411.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/19978953682.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/49575022537.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021091905444173499.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/gofumafodixoranokozidapom.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161538981ad902---jividigexaf.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/17205528396.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/sugukefaxevikojasut.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/13868068804.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/suduva.pdfIn PDF document text
    • https://avflash.nl/upload/files/konutariwus.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140839bd6c9c---97564505467.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/balubikafusurogaditina.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/97145565730.pdfIn PDF document text
    • http://airzo.net/userData/board/file/80577378361.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/41215878955.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/fixofefuwutujuzawisibek.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/d801a28f66e67f01f77ea6295e71e33c/zodorisofe.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/sofagugodovaf.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/64037104254.pdfIn PDF document text
    • https://songhongresort.com/img/files/1881482352.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/gejurojewasurinunon.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/zusojudanot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+download+music+from+pc+to+android+phonePDF 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_off0000b1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F8 14464 bytes
SHA-256: 089cdf751b0152fa39668f6b21a81e531ae9bed882c973079759efa86e1916d5
font_01_sfnt_off0000d64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE61 11064 bytes
SHA-256: 566da84a3f3cdfe24c78367e7227e2484814cd1379bd46cd71236384c2f47f2d