Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bbd2e9ee6e28cc3…

MALICIOUS

PDF

89.0 KB Created: 2021-09-04 09:27:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 3b744e70aac17ab85f70ab653ecb4a00 SHA-1: d23c07adcda6286938e4a29576086a43721b04dd SHA-256: 3bbd2e9ee6e28cc3d359056968724c192d13e3c9c9b6e46899688938d7b83e0a
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://prolocolidodisavio.org/ckfinder/userfiles/files/69915805967.pdf In PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609220bc901b9---mabiz.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/62301780440.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-15/20210515053235276818.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20218232052257960.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/f5a7930a22f8049ede66f0d601dbae60/zofozawisuno.pdfIn PDF document text
    • http://mrsgladysosei.com/clients/f/fd/fd76c46f75d01f7adbe86f52c2a5b8c1/File/jorasitalakakofekus.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/kodotezoragabofivazupu.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/64363117453.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/teretuj.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/bexejinuxajelofapesepa.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/kium4g1ti1g217k46v84ks0inv/kibuwem.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608991c565a5c---forezuvonujuk.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/c3cf7ec5fecdcf27783fd2db539d6e3d/guxejejebepita.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/1131690861.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/rekarutofogif.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/tojupoxikefezasi.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/53344176426.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/2tmuf3qvnp331g6hvit1fes9ob/93913587115.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/c31b61cd9cb2be95bee2b0736fcd6a29/mukakapojowilokababejo.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cf8fccdc0---47706259283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ansi+code+list+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_off0000e6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E0 10332 bytes
SHA-256: 0f63d89d4f80311e3380cf74849d154e1de8012cadb1a24615ca7a9ec696a111
font_01_sfnt_off0000fe4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4C 24520 bytes
SHA-256: 787fcabd152693adf81f7e6308fef3997540734970021659740e223033ea99cc
font_02_sfnt_off00013e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1