Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1727cc074ac1024…

MALICIOUS

PDF

72.2 KB Created: 2021-09-19 19:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8e6362d0adc81f10c043ee9a3c7a071d SHA-1: 70dcb97e86dc9b7696dedc7ade0ebe0bc7f871f5 SHA-256: c1727cc074ac1024d136846ec7656d03e8770af14cb8ce2fe3f0cd41b49ae09c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baldonimarcostudio.eu/userfiles/files/robejetipozufenaxeret.pdf In PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/48734596964.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161414b710bbdb---xosikofuka.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/zajizinepigizisud.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/71071223276.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16139311d3192d---jupewaxipabetunogowifafa.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/bevemafosomunalofujanem.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ed031d8a3---zetejusino.pdfIn PDF document text
    • http://ranch.pl/files/file/32601765898.pdfIn PDF document text
    • http://htwy.com/upload/file/38799125320.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16140c69a27e26---963518085.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/55364839825.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140480b55dd4---15208012918.pdfIn PDF document text
    • http://hnspkjx.com/d/files/86227072633.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/90126874767.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/pekafoza.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/53130846994.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/fidofopixasewebo.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/vunupa.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/9231848485.pdfIn PDF document text
    • http://annabarons.lv/files/files/mejosit.pdfIn PDF document text
    • https://limadelimon.com/images/file/1063181846.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/d0ab16b3a90b0c5e6012aa3abc764bf4/rumudogazedo.pdfIn PDF document text
    • https://interangkorcondominium.com/userfiles/file/50006444134.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/2021936483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=dream+league+soccer+2019+hack+android+1PDF 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_off0000b526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD38 16600 bytes
SHA-256: 31a8f67100b6debe460a5babd7b28345d65505dfa9df94502d19c59c3020f57a
font_02_sfnt_off0000f726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF726 11376 bytes
SHA-256: 8389db3e963b1139b3a04e274fb8e10e717d3302aada7f4cdff24f4683018851