Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4bbeac0ae49ca2f…

MALICIOUS

PDF

151.8 KB Created: 2021-08-11 18:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: da6a5c3d43a11969da3d7025cc5a0e5f SHA-1: 3dc96094a37edeb336893d0a20802759cc479cd3 SHA-256: d4bbeac0ae49ca2f29f8c11f8b0d5c4e8e81813e9f0afbf8c4d0e3372da76a99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and 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 0.9985

Heuristics 6

  • 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.
  • 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://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dda2c913f59---butemesifotonateliz.pdf In PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/79812551e78e2e5030b2eada14efba1c/2797618338.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/q7iodlhc6g97doib876p06cq13/lujukizigudenaloguxilo.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/witudawekeroxeda.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/53b9q10m66th7ath6610hg0bj2/4815828769.pdfIn PDF document text
    • http://dalaichau.com/files/47738377505.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/terisimisutuxak.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/7uesh7okmqtqoe1i2o8gbvl672/63572150770.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/49088915547.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/30345082537.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/jatop.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607defbd1311c---davodorixaxuf.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/bagedekonebabut.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/45872f64036f89a8e541902b02e295d6/21386684088.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/18bd400fed8406282101b8b250c369f8/zakegegib.pdfIn PDF document text
    • http://cartopack.com/Images/file/63234714135.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/2tfld270pbiknljdkgc7nsp7v4/dunoze.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/33994777942.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160775f7a128b2---11286726291.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/35846867197.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/zuvabazesusulito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=cuadernillo+de+ejercicios+de+matematicas+1+secundaria+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_off0001e8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E8EF 11096 bytes
SHA-256: 737c08fa1a268fbb3a87291131481557b5b3c30a5799d9a86d1950f41e1517ed
font_01_sfnt_off000202be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x202BE 19840 bytes
SHA-256: bfac2d4ba23e0d80c29c1d38f3ec7ffcf19176e0945b7bc79fca54584dc480c1
font_02_sfnt_off00023634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1