Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e1c17ea32f5dd8…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 02:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f9c11471dfade6119b74a387b7d7999 SHA-1: e82b55b87ffc292b469e619c0a80c0bad8d73caa SHA-256: 54e1c17ea32f5dd8e72003f249f161320d9f437728a99b7bbf450a6278dcd737
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised WordPress sites, specifically targeting file upload functionalities. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to PDF files on various domains suggests a link farm designed to obscure the ultimate malicious destination.

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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b971e22b94c---fegeni.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/c7t7au0jlfcsfmtgg9fme387a1/bakawizumibamitaz.pdf
    • http://airconbank.com/upload/fckeditor/file/wanatukovofo.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdd01c98877---zedex.pdf
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/xufuta.pdf
    • https://balticstroy.com/uploads/files/13343115031.pdf
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/bexekewitotezege.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610592f27cc9c---83639175912.pdf
    • http://noithatdangcap.vn/app/webroot/uploads/files/vizigedisuv.pdf
    • http://abwsalisbury.com/uploads/files/kopajowasilujimeli.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084110bbbfe7---74620648515.pdf
    • http://jshtextile.com/UserFiles/file///nugejarasita.pdf
    • http://touchpanelpro.com/upload/files/joforisujoje.pdf
    • http://abaj.cz/UserFiles/File/62802424133.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff0997717d---66204485203.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861456dd74a---21775162501.pdf
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/30667844037.pdf
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/56538109316.pdf
    • http://tunglamgarden.com/images/fck/file/gogebazinigekufopeko.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/7t3j1nnaquvk1sld72o1lf8msg/49555279624.pdf
    • http://likebarcode.com/image/files/20210630_144135.pdf
    • http://wksx.top/images/userfiles/file/64826984702.pdf
    • https://led7.ru/file/54208962087.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ede012784e8---pogizuvezaj.pdf
    • http://www.clc-engineering.com/siteuploads/editorimg/file/43192436684.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=les+accents+exercices+cm2+pdf
    • 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_off0000d815.bin
84305211453457eae42c34612a01666e68c1835ee3ed9c7fae08b6a459d06bb9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD815 10792 bytes
font_01_sfnt_off0000f102.bin
ae491ec13a8a762c33cdcd04fe43961b97e33c9b4d127f18bec06290168fe387
pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 20116 bytes
font_02_sfnt_off000124ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124AE 16792 bytes