Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e8acd8157cca44…

MALICIOUS

PDF

73.1 KB Created: 2021-09-04 20:19:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 27e651cb16ac9b7b01f7c6ced1484fe0 SHA-1: 39d7089a32ee58a116b05b6797ec9d92524b8a64 SHA-256: 93e8acd8157cca44219b6308d34c90af8ceb92d41aa6881fadecf4794451b169
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of links pointing to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lure users into clicking links that lead to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/b192dac1551d3fc10c33475f9819d159/mulunujepupobe.pdf In PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad109bb3be2---jofawesurikinopigal.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/914764e2014faf2d45359ce8579ad005/74335261015.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb6c67905c---bexokirevasipunemegewiba.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/91998288458.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160e47f9186a83---bogetususunawixodem.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/zidigaselaw.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/38513674211.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/dejusuvanatizufakabagi.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/adb7a7809ced22e2c42c7077bef26b51/8863454394.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/pdifnb1avd20p7pje07lg81t57/redale.pdfIn PDF document text
    • https://cecprint.com/images/file/vegosakolupodi.pdfIn PDF document text
    • http://dalaichau.com/files/5771036976.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/0fcac6d48808ed70d9130474c41ad5a4/58480854495.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e57614ba6---46913094806.pdfIn PDF document text
    • http://kmsenior.org/file/files/lorewoxavaxibidisedom.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/gotefisogiwake.pdfIn PDF document text
    • https://sealskinz.ru/files/file/virewajuv.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/54834964584.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cadacdb490c---74380095156.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/bomolifupimivitigip.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/fumedukowuseju.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/69485052456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=castle+serenity+pellet+stove+user+manualPDF 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_off0000bd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57F 10724 bytes
SHA-256: f177436768bae186e9e4012c2fd91517e9591f1fce778273415ddb63a337322e
font_02_sfnt_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 16036 bytes
SHA-256: d8992d4671516dee0c5db77808c7d7a90d99bb2fa54ac3aab120a3e887233ad1

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