Malicious PDF — malware analysis report

Static analysis result for SHA-256 97e4dfc49b09e303…

MALICIOUS

PDF

94.8 KB Created: 2021-09-03 21:18:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b9084525afa91945ddff5b61092e5efd SHA-1: 060b308f3de457f1473a6c3ad33d1f2c0f7ba0ff SHA-256: 97e4dfc49b09e303f2a9ac6ff4abed8686f7b16ee0298a6f28a2fd807b2de5ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ventiliatoriai.lt/js/ckfinder/userfiles/files/moranirupusuvemoxesofub.pdf In PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/56796666010.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/ratologonob.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9efa7c3b3e---vuzuxonatadugi.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160835892c4309---zorowojedibebefajiguru.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096715720a82---zonijorevepu.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609202bcf34ef---30406562658.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/612a39dcc1bd705890c0e5471477b75a/romidesiwutuvus.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/rjj3rfrddrtcbgh6oe763vfg56/68646588136.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/8032227934.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04911ce842---nozujekevalul.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/junusemem.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/fmc85s7nerk6ao759rc7uerop1/74921200612.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/jusibabelub.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071becb3e747---zovizibobutukunefidu.pdfIn PDF document text
    • http://scpt.it/userfiles/files/jerefelab.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/biwaguw.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/51269796399.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///zugizuvezawapuguwatug.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ba7d1bc937---xujupa.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/55042394361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=descargar+el+camino+de+sherlock+libro+completo+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_off00010663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10663 11300 bytes
SHA-256: ac22808716af4078624a4398a16a72d9cf6a13b2a38b2d603502f916b949bce0
font_01_sfnt_off0001204e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204E 20756 bytes
SHA-256: 73421d432dd9265f3a0503de5428b54c4af3ee0995a6f70999d3cb7593f1a75a
font_02_sfnt_off00015501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15501 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1