Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba7fb7729317bcb…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 10:25:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4a84204d46c801559a45768243384bb SHA-1: d917c4f480716e25d4740fd60d8f4da9ca8df32e SHA-256: 0ba7fb7729317bcb0a53687f5ca92b5cdd2edea881dc09b3a08dc8509285390a
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614684f27a41c---76510693044.pdf
    • https://viettincapital.vn/upload/files/90573586090.pdf
    • https://whitesal.com/data/images/file/3049_20210901133552.pdf
    • http://el-system.jp/uploads/2012/files/monuruvatevazeg.pdf
    • http://ecogestval.es/userfiles/file/38332184049.pdf
    • https://zabulgaria.org/userfiles/file/65951205637.pdf
    • https://foulardfotografando.it/file/lapaburunamixamuzokofuwa.pdf
    • https://natyabio.com/uploadfiles/bozarokeka.pdf
    • http://eortak.com/img/fck_temp/file/68815481013.pdf
    • http://bertoniamministrazione.it/bertoni/public/file/34680497271.pdf
    • http://theheavent.com/userfiles/files/62468914711.pdf
    • https://tw-itemaos.com/ckfinder/userfiles/files/66768504255.pdf
    • http://meruzhankhachatryan.com/app/webroot/files/file/kixonisukijipisuv.pdf
    • http://askort.pl/Upload/file/34858745669.pdf
    • https://chingchia.com/uploads/files/202109060236381999.pdf
    • https://nstoplana.rs/ckfinder/userfiles/files/talope.pdf
    • http://location-venise.com/italie_documents/files/56063097141.pdf
    • https://khangle.vn/uploads/images/files/37859722761.pdf
    • https://lesura.net/userfiles/file/60517537072.pdf
    • http://ohappy.org/userData/board/file/60854202238.pdf
    • http://aeon-dev.com/uploads/files/202109010708256201.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7ad39fbfe1cf2c93b463c2c662df86ff/72947065357.pdf
    • http://sbs-group.co/userfiles/files/mopomufarugowafozuwutuwiw.pdf
    • http://impactpluslearning.com/ckfinder/userfiles/files/73919635675.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd2e523b53---27772052816.pdf
    • https://www.cygnusdvlp.in/nitdurgapur/uploads/editorUploads/userfiles/files/23863753064.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=puzzle+video+game+best+android+games
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d98e.bin
a420f7433918bc50d75c36fc757205d2291b8e82d7fac52973491278e8caa929
pdf-font-stream PDF embedded font (sfnt) at offset 0xD98E 10956 bytes
font_01_sfnt_off0000f2c8.bin
3acc67831639c6272db6a44b75ffc9082e275112b56f0743a8533e7b92e556cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 16388 bytes
font_02_sfnt_off00011d6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6B 16792 bytes