Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d14519026c1850b…

MALICIOUS

PDF

93.2 KB Created: 2021-08-12 15:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 842495073932d54aa204b4363a577a04 SHA-1: ad30bf75da5c4ab780049ace95796859938a9bd1 SHA-256: 4d14519026c1850b6ba7b70a4441c13df919756f76ffdbd134f0a5b3a65378f0
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 0.9959

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://synerhu.ru/uplcv?utm_term=descargar+pokemon+gba+hack+roms+espa%C3%B1ol PDF link annotation
    • https://soudurelausiere.ca/upload/editor/file/kasovakisuzo.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/jeguvapulilovilibul.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609da3ade7fa4---savodaduxominu.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076e9f071a1d---sopivudamonerogovab.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16110c51fb740a---xifidelisunikazapuk.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb45c44a41---rapazusaxomimibibob.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/5jn0j994fnkaghfn1d39qvt66v/82179237357.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/15756578229.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/bainp81j76r7hal4bslojomt21/gozewifubaxobi.pdfIn PDF document text
    • http://torgoborud.org/images/file/dexibofogile.pdfIn PDF document text
    • http://bienbao.net/uploads/files/rotudozekolile.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/171ae25812c9ca89e1603210f165ebd4/fuvosapozewakarijabinuwow.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/c804893884af404f0386543015325e0c/89779336422.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/21b36f8d448a7c87e9cd2900ebae4b20/29602244399.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/28279134591.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/84e7c6ea7f4ecea28f2c9afea16a55e3/83299946257.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/lasaxukelugupawagel.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/vawiw.pdfIn PDF document text
    • http://simonide.org/userfiles/file/15187624116.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/roremopinegajizikaroliru.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/51cfdd00a1fc828ebc5829b27319c96f/delenila.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF165 11072 bytes
SHA-256: 4b753f87138d724c657692349454ce87e3bd7f78605be76932f6037c8f3e2f1c
font_01_sfnt_off00010a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A83 4404 bytes
SHA-256: 636e509fe597ad619fca050c13003c8a4a492aa59fe959fced5be0ba145307a1
font_02_sfnt_off00011b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4B 18976 bytes
SHA-256: 53c7c4b2a2562560d39617f9eec9069c9eb83ebc43c6ba256d97820e2fa15bbf
font_03_sfnt_off00014c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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