Malicious PDF — malware analysis report

Static analysis result for SHA-256 38b0ace0c445fb2b…

MALICIOUS

PDF

79.5 KB Created: 2021-09-18 08:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05b67cdee3172ae1623a25ffacbb7b67 SHA-1: d2a87aaed775ed5946774aa5736f00ad2b52ad12 SHA-256: 38b0ace0c445fb2b5e34979625c8ff82ea35ba97366cb5757c093299cb04d108
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to other PDF files, many hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the structure suggests it's designed to lure users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=moto+update+e4+plus PDF link annotation
    • https://goodluckfishing.com/ckfinder/userfiles/files/danixutotelijotov.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/webuwozej.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b718a79353---pejidipijatiberub.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210905194959.pdfIn PDF document text
    • https://superchills.com/userfiles/file/sajolawatufujeranusofud.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/bikigelulemebe.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/bumoboz.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/dakixodinotunuminama.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/44573098069.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/33utmkhtt1r2cs1l3uu95odqi3/20396392069.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/noxobevo.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/f04aa7271569fc1c1df77ac8a8ce76fb/lenezodexi.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/26833588332.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138b46040a41---47434339325.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/57107110153.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/92322351219.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/mawebonupizukuvapol.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/bedunogeja.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/sabiwanexusive.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/80412132328.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/31192150265.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/gawisamazofovajaxox.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/89895457236.pdfIn PDF document text
    • https://geloracinta.com/contents/files/munarupoxusevuwewovopax.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D4 18104 bytes
SHA-256: 159a56e995bf16d0b7ba4f835410ff60927f4cfa0f1747fa925cc3386bbc6967
font_01_sfnt_off000100d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E8 10260 bytes
SHA-256: da5bf969c2cca0097c468c56283d85123772b5549ba8544fb215220c6fcfe5a8

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