Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb243c373794c6c…

MALICIOUS

PDF

94.5 KB Created: 2021-07-19 00:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6a4dddfa844fe8112ff1ec3b29e4ccd2 SHA-1: 1a67063ff55a4e89d8d21152daff311f910c64ab SHA-256: adb243c373794c6c9d525bc5607d64bc4fe03a65b2ee4f24703b8c78d4d77790
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other domains. These links likely serve to redirect users to malicious content or phishing sites, aligning with a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://wallsfamily1912.com/clients/876683/File/55966935131.pdf In PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/506f6029fc8a50eac07590ae2f1d72e4/gelatudivogirawura.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969d00e75cd---wizew.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/77ee5bf9427a3b8182e792149b84c281/jisotusiworuxigowoloderi.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/3491e840dc7e6e57707f699162bb6a2f/62806941483.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608878b47067a---77650238688.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/demimabajuxalakoguberubi.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/beb6a5ee26c6f6f7f907128ae0e8f94b/fufexegonabevep.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/54225207972.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c400d266d30---litobideguronotamuw.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/b13177ff518cdcdce514efe643bd69d0/bereworix.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/17f69c148cc935430961ae72c6508fdf/5261790627.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/sekowabikijup.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c87ff651306---75279476544.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/d89a414aad54db041288bc88615d67c0/36967233136.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160779fe10325e---zofatupefikevevinituli.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/682dfe25490850a5d7015d70569e0a4f/62954082758.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a69eadea781---12840498386.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/f3f014e73caa2084bf94a6efcf1bc85b/rowakalona.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/tizoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=a+pdf+password+security+serialPDF 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_off00010d10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12522 18032 bytes
SHA-256: bbabab8b3ee6aa3c8b4a9b35121c970c85f70e6d29df7c8be2cdef2a6009f458
font_02_sfnt_off00015400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15400 10792 bytes
SHA-256: a23f3681bdc06d6945939c0c227b64360bec4920683977366aa9b188b97ee305

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