Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce0c14c986faa165…

MALICIOUS

PDF

75.6 KB Created: 2021-09-01 06:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 88b86a7a9f634fd94da2a39bf1a68f55 SHA-1: 6fc30635f902ce75510af4386fcc3b0929d781f1 SHA-256: ce0c14c986faa165a1c76100c215ffb7dfec4eca1e4d7f48d958007d7c278cd6
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://luathoanghuy.com/uploads/files/47513118954.pdf In PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/11c83ab402d90bbaa8bb0b9cee98a95e/niserebele.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/60111267413.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/xubunus.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/3025349563.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/wimazopi.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cb2834c31---pexasulapububolojenef.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210611143041.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/rabenenotoluvagi.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/retar.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787268bb621---64099785389.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/358ef8942ec65dbab5b95a48f815b8cb/dusovulukixu.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/bezapo.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/bc596831211b3dad04b30c11f83c07d2/96142151118.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c0fa7c94---tarufubikekawasidu.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/lololanovelo.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/77088598204.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/84342619316.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/95651399717.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/67170410066.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/7b88e0c4de787f19a6fcd161c57b5d99/sozalofitozopemamiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=chemical+formula+of+all+elements+and+compounds+pdfPDF 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_off0000c5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE08 11016 bytes
SHA-256: 539f6b895ed7415cfe2068d18fd92fb9d684395e7553f85855aa60e5b9fca480
font_02_sfnt_off0000f773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 15736 bytes
SHA-256: 24e9fa2187f6a5021ba8b96b24d5280b8a31b990ab90fea8a1c37972e834f451

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