Malicious PDF — malware analysis report

Static analysis result for SHA-256 143faec6361766d6…

MALICIOUS

PDF

89.2 KB Created: 2021-07-02 00:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bb5e7f4fc71f9a6c0bcf3f5b6087a3b7 SHA-1: 51b218172dc5ae857721712719eb73f6425897e9 SHA-256: 143faec6361766d610d7b25bc8d50ff63c79fc6407be158e029bee51698797a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites hosting other PDF files. This pattern suggests a link farm designed to obscure the ultimate destination, likely a phishing page or malware download. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ku029674gaiemjfbgt4ihd8785/78575153913.pdf In PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/82252064146.pdfIn PDF document text
    • http://zae.me/datafiles/file/7798223256.pdfIn PDF document text
    • http://intergeored.com/upload/File/wemov.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c41ef16ab4c---tagoxisibu.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/23931040682.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/f3ecde65de55c720651d9bbe14ba0388/wofajarowagaxomuzerasofab.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/79052965645.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/banaralokuboxaparifom.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf04e3afce---tiregivigulofezorogefer.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/dfb816eb34c70f2c1f98513621f2c736/rovuwawujetimubekamagat.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/70348935893.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/20370776347.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/219ne9bhfa0vodfqnbetochuu0/72314013914.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/16jg4c3les0320f5apop2209sm/44106733495.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084634b83980---xuvunixizofiz.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b20b2d3aa74---67116923589.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/509c6b2b8bebe5b000ec9ee1f21bf4d0/sililenesovuzole.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/75049636881.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4518cd0bd---65806970863.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609842278ec1e---83817965665.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/11357444870.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/vezufarolakajonifutatoluf.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/34mlsn5p47h6ftkrpht3i8pmo4/37652916683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=single+player+commands+modPDF 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_off0000f503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF503 10948 bytes
SHA-256: 3dfe22a986d6213819db1b4613e1d817a5ac6d4dfa3ba2c16b876df69f57a631
font_01_sfnt_off00010e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12632 18000 bytes
SHA-256: fac958be3f10406856115fe3c054e102d555ebd1925cf883b3b180aa137cb64d