Malicious PDF — malware analysis report

Static analysis result for SHA-256 4548940c3be7045c…

MALICIOUS

PDF

76.5 KB Created: 2021-09-15 11:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 488379dd6eef6fd47d062adff18e2595 SHA-1: 4748f64ab937692d2ff78d717819d7cd1ce4ec82 SHA-256: 4548940c3be7045c9771d7fa72f3f6720c26ef088c0425e81c44b0bb474bb161
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://paeonia.ch/userfiles/files/xedemosifen.pdf In PDF document text
    • http://nhatnamvina.vn/rich_editor/file/76111714599.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/83571119138.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/f99tuls909l26bgj5085veg1lg/rufukabonuror.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/40521486079.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/19430950582.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/19254220294.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161416272a0c87---30526166160.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/48211440867.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/44522768113.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/nonifavuwovepopaga.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/49383559439.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/13b84a076a416df001b763b656f40a52/xejukazogudalajigumi.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/66872359055.pdfIn PDF document text
    • https://gangnampools.com/contents/files/wilekujaromeje.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/69732463271.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/pavij.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f529d8c440---zareta.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/91451080252.pdfIn PDF document text
    • http://draftingfloorplan.com/ckfinder/userfiles/files/95866608961.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/d0f139508b5bca72c46cfa2e371c5221/koxalamatomuveg.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/99339158048.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fbf634381---lepip.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/ragupopexivi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=mountain+wallpaper+for+androidPDF 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_off0000c680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC680 10504 bytes
SHA-256: 513a8d557ecd4dd4c24913541401d70318e2c6de48d48ebc9533b54995f15ad6
font_01_sfnt_off0000de8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8C 17496 bytes
SHA-256: c987e7168106967b1a8eff17b45cde612f4412ed63c84f593c35eb7fc308fe7b
font_02_sfnt_off00010c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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