Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4fdd555317d161…

MALICIOUS

PDF

81.8 KB Created: 2021-09-06 07:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 23019a7aa3ae3b0dd75e188db339af0e SHA-1: 7d5efa598eca4c31415d49c0d8aa5233475c9dfe SHA-256: 1b4fdd555317d161e9d5bcb407c4dc5f7f6468dc0cc6dbf83cad8d1adbb375ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=rounding+to+the+nearest+ten+worksheet+grade+1 PDF link annotation
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ab9b97ff0---51928419800.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/begalisezaxasizasoti.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/lalimuzitijo.pdfIn PDF document text
    • http://imbirimbir.ru/files/tafepexena.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609441c796bf0---19717695669.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/nipemifolekujudud.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/terabusigu.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/0g5q08mglmshaus92o4g616gtp/15933802131.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/xofitesilatakoravus.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/e60869fadbc9adfd8fbb97a6e50f8d96/juguxubugagezep.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161091dfa45a70---seruvemi.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608430d5a4cc8---soweb.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/62093780908.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/ncjv5h32pkkcn5pgm379iunf34/37054265813.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/sonuvubusawebosi.pdfIn PDF document text
    • https://atiksigorta.com/files/54344032101.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/vowepimuz.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c75f1885df---wajuxijizajusake.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/898640710dfbd8363627eef930ea298e/zadogo.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160745e300b9aa---27767975036.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160727f95d1695---disebivivu.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088489809255---mateweseliramalivegusuxox.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8e86b8888---bawexerajawotaxoz.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/56431921927.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_off0000d6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C2 18532 bytes
SHA-256: 1d36d5ad82e73848a0faa30bdd10a55ce7419a09358f554ae466a0fa09a87036
font_01_sfnt_off000106c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C4 10856 bytes
SHA-256: ad8271c4e10ece36e3accd4fe8197c1eb5e34baa4ae3970c253da2ed5e03d002
font_02_sfnt_off00011fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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