Malicious PDF — malware analysis report

Static analysis result for SHA-256 5481ca103326d93d…

MALICIOUS

PDF

95.2 KB Created: 2021-07-28 02:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8ea10471eea64209eb93e026b8150272 SHA-1: 223b981ed43eb7511b8800b5dd2b3e95f519db3c SHA-256: 5481ca103326d93d401e1d9676df9f6dff426d21a2770794dc66bccc26e2c859
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of multiple links pointing to compromised WordPress upload directories and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a malicious intent, likely for phishing or distributing further malware. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079f0aa65ada---71374101793.pdf In PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16079fe0b268dc---xifonegunebawi.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c40d821c713---xiwojisofinotozamerufu.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3acc1d70c---14893923084.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160984b9d92166---52019579616.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/22657210036.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/c525bfd9074fcd0baea800beccb88526/zotutidetujovinupazujizis.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/c9337b83c03128deab1c1f9cd4f851b1/81005072695.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/k637ku89c07ntf841e6kga00aq/xejus.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae344e3e21---86829598147.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160adbb7f1c326---56583691690.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/v215ji2323al16miuvc8m75ksb/43988337581.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/vudomemuzoteparujagegere.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/d2b1dabf1c79f6e5334ac50847946717/59196418328.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071b7a4861d0---kopijiwuzipizobabenazesub.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/toguwudutigeradobuzosixo.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/fekonevu.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607125fbe4567---gonupara.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/36405446147.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/60229253669.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d43810375f4---ginevamafek.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/jesuzukiwemepunufosumose.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/7b1df94f538e57fc0552df6d8407b4dd/muwunet.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/abb1552b05563993727d863f04ce07f0/34439314028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=barcelona+vs+real+madrid+live+score+2019PDF 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_off00010708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10708 20444 bytes
SHA-256: 6e9853ec732192a01368d08c369459c48ccf7626b5563e5692beb0f9cb71962b
font_01_sfnt_off00013a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A85 11012 bytes
SHA-256: aa3c0d77197e5f1f5842a96d85686929738630d9d2a9efcb31c0a3ca5559179e
font_02_sfnt_off00015434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15434 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.