Malicious PDF — malware analysis report

Static analysis result for SHA-256 e823fa395826304e…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 03:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4daa00b2058ae11e90e8b5f606559399 SHA-1: 50048dc3b03709f57cae320ab292e2e07bb1cddb SHA-256: e823fa395826304ecc523937b3892d6f82bc713a64172cd3b45fa25eed6abedc
212 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous links, many pointing to other PDFs hosted on compromised websites. The presence of a 'download button' lure and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 9

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=teach+yourself+electricity+and+electronics+6th+edition+pdf+free+download PDF link annotation
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b27d6c296---giwemisetapaveruz.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bee9b433a8b---23231727702.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/9046aa72be3dd473e34a4a5f2011c5a1/31666332456.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210820_230039.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160917a88d4019---zerodil.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/fopazizas.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/79407356779.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/xuwonetukitokilijisajuzo.pdfIn PDF document text
    • http://konberdbio.com/upload/files/73600835824.pdfIn PDF document text
    • https://dm288.rs/slicice/file/33750459748.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/gezuxokelotakut.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/79991409690.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/98573858162.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/jinonuwukagavelir.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/82161566362.pdfIn PDF document text
    • http://grimastone.ru/files/69962628043.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/14185330029.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608692f4c6f7e---80924041445.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/puvanik.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/bonuzekereji.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/lenut.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/virevafiwaxetewolirijoka.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/50309009877.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_off0000e110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF927 11148 bytes
SHA-256: bb2c415d6d1f067f19062eb27f407daad17d0187835ee8867fd4e4aacf7ea73d
font_02_sfnt_off0001133c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133C 18152 bytes
SHA-256: fa189529a309de7a57641085c61ff96c1f03ca8a9e966e1a38a40a569d2fc483

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