Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7559c638e95f5ae…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 13:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a91ad806eccea04b4eb19d640d872118 SHA-1: 2090d15e0b87c7a23f439c0b3627b0ba58c75b71 SHA-256: c7559c638e95f5aee0f6ec6fad620234715dbfe792631b3cb6f7fd9901c90430
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure itself point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://kolkatanagariksammelan.org/ckfinder/userfiles/files/54906898445.pdf In PDF document text
    • https://gsm.company/ckfinder/userfiles/files/46859518458.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c11cf800c90---31449713675.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/fbd42aa5151ff4758fef5acce0474252/digopigaxon.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/64041106934.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/oov78ueau5m5j3n7flnh37s153/93999197367.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160accb98b476b---roduwerotugisevubafimedej.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/fojepeximobemewizoj.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/87663342063.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/jexasaweleb.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b69ca67af34---83993088195.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/fevebilorazaripaz.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/37103839945.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/89023341349.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/7c7e3c34c5ba800904128db09349b879/52685806649.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e1884f100f6---37391229467.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109041128338924.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/55198081615.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/43070879321.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/89590055633.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/42586041553.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/52198485874.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/59703851598.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a35b5b19859---zenedulusawetekadigipojid.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/8734718130.pdfIn PDF document text
    • https://limadelimon.com/images/file/rofesurutiserixizex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=syringoma+adalah+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_off0000df9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9F 10736 bytes
SHA-256: 9e2ff88f4ab80754cc973387234f7349f6c296fac38be1d6203aae54a15d5e4f
font_01_sfnt_off0000f7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDF 16280 bytes
SHA-256: 827639c08775826726b819ff17e077fff740fdf62d763ad54924dba1355462a1

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