Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef96035468773427…

MALICIOUS

PDF

87.1 KB Created: 2021-06-28 09:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 233775c9c1090a714b45fe07a1d49441 SHA-1: dc58a8c536255946a535c0ed6f9365acc0421ec4 SHA-256: ef960354687734271c6e1cd9523475dadaa13cbb0d0f4d786b4814e50b2d32bf
196 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised WordPress sites. The presence of a PDF_RANDOM_URL_LINK heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The document body is unreadable, but the heuristics indicate a link farm designed to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/845164476f15483a3b2c43af0688ebb6/3057530283.pdf
    • http://plkorea77.com/ckupload/files/wofegedepagijepi.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a01bef402c---25290828450.pdf
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/radubab.pdf
    • http://dobrasekacka.cz/userfiles/file/45857043058.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/127c063b074b62c5283db7387a0c493f/tetumosopo.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b28357d302f---64059509392.pdf
    • http://brmxn.com/userfiles/file/20210514152133_7p18ih.pdf
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/wozatenopu.pdf
    • http://tc-antey.ru/uploads/files/jimedarewubobetewafexe.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/dc679e125b237d06b9c956da6b9101c9/3668482098.pdf
    • http://precedent.by/_newsite/images_from_html_editor/file/jukivebezetizik.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607104efed156---57062292375.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/2636c97555d2dd68128d27e63aef4a70/99847025204.pdf
    • http://ankamet.com/userfiles/file/54517818994.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/fa6ed3f3c788691ad176b6b1f004462a/vofulisonugodedazezojiw.pdf
    • http://banlinhkienlaptop.com/userfiles/file/44066290454.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/fac6u7lkfo1ulojmmddbmtfehs/68944769702.pdf
    • https://osikovo.eu/webroot/img/content/files/56597039815.pdf
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/24490184543.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d71e4b015f---32382524927.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/d103bd61672afec042892d4c24be2155/tafutavov.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608734e0c2089---31680692304.pdf
    • http://cycling-software.com/files/file/ruwamuvatak.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=download+game+black+ps2+for+android
    • 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_off0000efa0.bin
b60b0b6a17f4adfd5c0dc75bf5d55ef085a436b58bedd7defd91f760fcccadb1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 17180 bytes
font_01_sfnt_off00011c93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C93 16792 bytes
font_02_sfnt_off000134aa.bin
946ee13fbfedbe9f795c8b6b6793dfe71897a557222b34cc72e5b0dae355ff7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x134AA 11304 bytes