Malicious PDF — malware analysis report

Static analysis result for SHA-256 94db556abdbb565b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 16:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fd77806c12e01a66931ec417d56b7162 SHA-1: 2e6a25f7a8ee7f3888f73f271d4f8908fa26af09 SHA-256: 94db556abdbb565b83bf4c1846761c4d680e33125213d8ce211b001930d61eb9
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely a phishing or trojan delivery mechanism. No scripts were extracted, but the structure and URL patterns suggest the primary goal is to redirect users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://pasationtravellers.com/root/FCKeditor/file/18026850189.pdf In PDF document text
    • http://carzip.biz/files/uploads/files/28865359142.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/98007760301.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084fa6ae6ebb---61455842167.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/834aqm0a6tg5jjd77noees83gf/90913414727.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/69391513732.pdfIn PDF document text
    • http://fsanaq.com/upload/file/2106220754518613763l4x1xewep2z.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4ee4c757b---jaleridido.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/devatebelikexo.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/3191382834.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/mefijixov.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607addf12b000---xufibute.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202108141201375275.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160738d15a35be---95711302888.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/33050601483.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc3592ca2b---bilixalope.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/xofimexivup.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/82861364851.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210823164234.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/vezemolusutanapabotata.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791ca5e77cc---74639287431.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8597a6d7dc---92170082373.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cec0719d6e---vapakokurukixeboxejelik.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/42617776337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=documentation+format+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_off0000e0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DF 10668 bytes
SHA-256: de28b270246ce112abea5255507956ab1517bc0d3abc11477e8c15a5613cf79e
font_02_sfnt_off00011140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11140 17672 bytes
SHA-256: 32ebe5b9da04c3eb318537ba06f3687eccf15f168438e7e8b806208a21527b61