Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc7547cf208345b…

MALICIOUS

PDF

100.8 KB Created: 2021-10-06 15:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 91dc672826fc0f183fa3ccd2636b13b7 SHA-1: cb519916328e4c1716a35be8f36242d0cbd87533 SHA-256: 4dc7547cf208345b29ff8cbc7dbcd5792ad63bffe3d2ac5540980e3ea0c6ef7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that leverage embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161376ccaefec9---zalolusarodi.pdf In PDF document text
    • https://mosconi.net/userfiles/file/womipoludodevozamijitowom.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/18559745369.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/bowovaxasi.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/88021501848.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/dedisedovu.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/wirimumaxo.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/99692034019.pdfIn PDF document text
    • https://e-midas.ro/files/file/powelefikigumudebokim.pdfIn PDF document text
    • https://iwistw.com/upload/files/rutoxeja.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158340aeb55a---ruzozajigakanabitoj.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/buwuzetovo.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/58265283316.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/251ea9a19291087062b5bdd3f6c7ede9/bawowedon.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/suneguvali.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/kibogojajedopupusimivu.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615a3309d55f4---vuvoladebuxarijajugizopu.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/46823701856.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/98951027093.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/ragibozijikolizefir.pdfIn PDF document text
    • https://m3nan973ru5-pa571.com/contents/files/wufonizupunizidefekem.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/kirewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=tongue+in+cheek+remark+meaningPDF 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_off00012494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12494 10520 bytes
SHA-256: 7ca2084555adbfbb5f22f95829845dceb42d4bf86ea968a0074d49b6fc288d2b
font_01_sfnt_off00013c56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C56 18896 bytes
SHA-256: 64cd101d86ec5284b5a26367cf7e26c6161e297e9cf99c9a64856c9914cfe2da
font_02_sfnt_off00016da2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.