Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd9c8094d1d69d4…

MALICIOUS

PDF

93.4 KB Created: 2021-06-29 13:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 408e2d2746f877145e5e13179f615ac9 SHA-1: 0d7b216d6939403051d470afdb97c2de630b19bf SHA-256: 3fd9c8094d1d69d48e6ca72b23fe8fc56449d4990d682cfeab0224d3d4ccac0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm hosted on compromised CMS uploads, aiming to trick users into downloading a file. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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.
  • 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 http://jagodkaprzedszkole.pl/userfiles/file/54567860796.pdf In PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/r5q5k3qc36bi1307o0t75afqhm/21157400702.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf35aa2231---juzunon.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/8c82403a013202b574de3e4dcc821d11/71797486652.pdfIn PDF document text
    • https://ka-base.no/images_content/file/34315231081.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/b3f3ecc0441a2945fe5f439da33a6442/votesemalunusojoxod.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/zewegofowibifelobefen.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/xomogumul.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/5dcadb88501ed4ddea121b3027dffc34/posasedepar.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c635d8b42a0---fodumafijuluzezixelo.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/10788002256.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bde0338427d---4386706021.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2e6b7b80a---64805211261.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/bagulaxakexira.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/30119869933.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbfbc16de6---wukikepegixod.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160909d122f80b---kosoripomixivovu.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160be970ea9dea---tagarezunuvisibufinijada.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dacdb08fb---jipitonanudunefatuw.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/bdb7e5effee055790c8f64d68f18976c/42302116115.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/58540183003.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/e85c34f165b67d3118a8bfef840dbdd8/68909786508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=download+lean+on+me+by+lionel+richie+mp3PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 18372 bytes
SHA-256: eb33819213a5891ea798a6e31fb99a903b872217f7e64c6f4916d6a5ccb04a2e
font_01_sfnt_off0001203a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203A 16288 bytes
SHA-256: 8a8fddc55a8e62168e724feb66b26d4c34e280f1248051dfe1d6c21db9e8a492
font_02_sfnt_off0001366f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E86 11024 bytes
SHA-256: fb33f2e67f494e4a6b97d970d711bf69d3a431b8e7ff98430778688a40d81739

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