Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a04f4faa20b45b…

MALICIOUS

PDF

70.8 KB Created: 2021-09-03 04:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 02d09a4f7914bdef244f0d8c872de259 SHA-1: bb85a2f5179bf4c10cac6e9c0de64d38e164fa35 SHA-256: e4a04f4faa20b45bfb6a15f3415f9eb0f2f9e43c285288691bee1170f640adb1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The high number of external links, many pointing to compromised CMS uploads or disposable hosting, further suggests a phishing or malware distribution attempt. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://irlanc.ru/uplcv?utm_term=tamil+movie+full+script+pdf PDF link annotation
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/hn51s3ari155v6c4tqhkbhgmt2/33376138724.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961dcba4a41---81152699832.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/63472694321.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/83884544496.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/febababatilinokepirilozag.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/kipomolu.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/fuvoxowexubegaxebezazite.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/xopav.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/42841165418.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/kotofudigel.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3da26c92dfc5bc5d04c3024b457b16d0/18919836084.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/34471975863.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/59678725117.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/5da2d6c19f4e60b2586730710ec0775c/pedowulavevapitipu.pdfIn PDF document text
    • https://migger.dk/userimages/file/37112163953.pdfIn PDF document text
    • https://soechi.com/userfiles/file/77079934472.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/turatosasusunene.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c661a5739a6---fakorufinewitogaginili.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/32494341019.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/59647045744.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/3098549771.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/88776504941.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/69512133191.pdfIn PDF document text
    • 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_off0000b162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC974 17352 bytes
SHA-256: 3d3d308f9ae55fcb40871a3bb5ac118dc9a88869729f4f02cd7c1a023275de00
font_02_sfnt_off0000f4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C8 10808 bytes
SHA-256: 7b6f9eef8c960b8781d014a60a0dfbaa36acdd86041eb10f14c5bc70a7388ec2

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