Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff229b5e6531638f…

MALICIOUS

PDF

91.5 KB Created: 2021-06-30 21:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da02cb75402480c4579659c911c3c034 SHA-1: 84605e0ad632ab4e8ad38ca75568fbff9d1db758 SHA-256: ff229b5e6531638f255fdff68adfb5b0d749e18aca161660bc922776ddae9d7c
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, indicating a phishing or malware distribution attempt. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the presence of numerous links to potentially malicious content suggests a high-risk document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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 http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb451ee9ad---56114539580.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/u7skvf2pmh6ol69bg7h6up8vk5/kekefixanezedobisapode.pdf
    • http://ahchala.com/img/file/35617239300.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/448966ef636312d2e13b2d1397f74e1b/wuvujiferijope.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ea8173c6d---46236352291.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e61ed32f6---23446319749.pdf
    • http://zabradli-znerezu.cz/userfiles/file/sevofulazadazukazi.pdf
    • https://rajaunited.com/contents//files/lafuvonewewanapivetiwex.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/hpfqbif3jla9p13m6oripft0pt/84283878735.pdf
    • http://www.look4job.gr/images/_user_na/file/zorelesipusexetefa.pdf
    • https://amd-export.com/site/upload/file/58808075421.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5096d7062---35791137182.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/2d2556bd11d8e5fa055464fc9333d009/simenulugewiseguk.pdf
    • http://ferramentabelleggia.it/public/file/paronoto.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607236b701f2d---5454846766.pdf
    • https://heritagecambodiatravel.com/userfiles/file/nobisenirosorurosupevot.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/a3th2s11oa27bjqni7uu0ce5ne/lapososonolafumudalezej.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/06fb25d7faaa162041cf48a55d90959a/mekewo.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b4e3998be6cfd1dcd3a3fdc1deb1c640/73991467468.pdf
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/94297686218.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/5pfveukl1059ongl27q5vc6thi/nobevubedisami.pdf
    • http://jnnycc.org/userfiles/file/wimej.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/masumedewepovodaranorepo.pdf
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mosorasitugili.pdf
    • https://hgindustrial.eu/userfiles/files/72791862170.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=my+perspectives+grade+10+volume+2
    • 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_off0000f969.bin
80144d1938f635b4cb1633943c7a8d43ac0b4eceb8f712387ccf11a0f57cf514
pdf-font-stream PDF embedded font (sfnt) at offset 0xF969 11320 bytes
font_01_sfnt_off00011403.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11403 16792 bytes
font_02_sfnt_off00012c15.bin
31ecb059f4deaf1ef4a4ebc907d3093767ead502216b4ffe87c9b8df0f6f3151
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C15 20012 bytes