Malicious PDF — malware analysis report

Static analysis result for SHA-256 78da815b75bf4b57…

MALICIOUS

PDF

117.1 KB Created: 2021-07-25 06:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: db57111754cc956d9b38f7f44eabec2f SHA-1: 2aaf5579b37728429e61aa85bc2d9f068eaf370c SHA-256: 78da815b75bf4b575b380628f820784584bdfd85e44a6ad51dd1a6d78fe04a8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, forming a link farm. These links likely serve to redirect the user to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bangprice.combangprice.com/beta/cms_image/file/gepetijaxarovimadukedoje.pdf In PDF document text
    • http://bulk-supplies.com/userfiles/file/tajumuzumagizo.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/23979104204.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/50d5babdf8e75bcd617c2c0d74935eba/60840059423.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/guwiwijinegunadigawow.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160885152d4c68---55822499800.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756678cbc17---togizegisagewimowevu.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f9e5266ecd6---wulaw.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/df5ouino28r8e8pappe611b7r0/26420540268.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab69c5a98e4---rijemiradegasuwe.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/47013501002.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/a3e00a759000b6c80c86d30cf68358d0/zaseje.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/06/23/96904287267.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/41232103174.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/55604276895.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdf41d346d---mibinadewa.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/jewikapufebimubotu.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/57819355608.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089a54fbb961---90546494458.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=imam+nablusi+r%C3%BCya+tabirleri+ansiklopedisi+full+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_off00016525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16525 18664 bytes
SHA-256: 62cc2d820ea100070cd896d142b961e1ff6f3bbf6a536efe589d92ee8d04076d
font_01_sfnt_off00019233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19233 11248 bytes
SHA-256: 85822cee6d5ab72931321a217a063296005b0678880a14e3d0895fc6742625df
font_02_sfnt_off0001ac0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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