Malicious PDF — malware analysis report

Static analysis result for SHA-256 37200f4fe78a4164…

MALICIOUS

PDF

79.3 KB Created: 2021-09-09 13:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5acd39721063ac7056ed0a71a537ebd0 SHA-1: 8fa92d4258942571d0c61e350b5b64be3fa2d291 SHA-256: 37200f4fe78a4164a2d89f1168af9b49c8dbddc7d788377eeb79af656957ec15
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple links to PDF files hosted on compromised CMS uploads reinforces the attack pattern of luring users to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/7e4bab3ifp4vu0s7udctskbld9/zalimowaxuxezikanuxi.pdf In PDF document text
    • https://paeonia.ch/userfiles/files/61733355246.pdfIn PDF document text
    • http://hobbes-group.com/upload/files/tawutofogixu.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/pexuri.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613635da75e5c---nemogugi.pdfIn PDF document text
    • http://telecycling.info/files/file/60157426266.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/nipebibepumorazu.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/40953152554.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/66637604955.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/85426431553.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137f9e8039bd---wolonares.pdfIn PDF document text
    • http://tayles.com/uploaded/56753962389.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/zukalekovokubu.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/xolatoxopakofovijovap.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/luliruxelemerewavimukaka.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/zaridi.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/mukogapiz.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/23836421332.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/meforefo.pdfIn PDF document text
    • http://boxethai38.com/upload/file/metuzuxoneredamilikoni.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/49119356943.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/bowasojesuwadarawaxavobat.pdfIn PDF document text
    • http://nhabe.com.vn/ckfinder/userfiles/files/vexibevakif.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109070043246187.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/guvemaxirovitumiwogudilix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=download+camera+mx+proPDF 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_off0000d47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47D 16640 bytes
SHA-256: ab2fa5e9c5ff344d63cf651ba96a578c198d20d728d9f04d4f3cd12a076f6eeb
font_01_sfnt_off0000ff7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7A 10504 bytes
SHA-256: ffa028fd07f6e9a722029bd1ce48ff0f94dd416af4e63775224e947e39d5390a
font_02_sfnt_off00011764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11764 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1