Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f44578551eb656…

MALICIOUS

PDF

109.2 KB Created: 2021-08-25 11:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4dc737ddc78b375e9a76f02b455f3352 SHA-1: 9bd13f0bcda1437cfc435e80a4525e61e7787dc5 SHA-256: 59f44578551eb6567c9f98aef8a7d78999e322e48f3ccff2e5aede4fafa237fd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external PDFs, some hosted on compromised CMS upload directories. This suggests a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/80998675910386b77052dc6bfaece99e/10404384583.pdf In PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/regekapotekutimobir.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/73bc3054981f98ed87b221c6cc11695c/82205884043.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cba54b9a0---8524245931.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d35a2be774a1cda01ecceafa1406cafb/vukol.pdfIn PDF document text
    • http://acril.ru/ufiles/files/gofubok.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/lhegfdvutc5urph76tekr7vjms/13780775669.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/murofigemezij.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a96632bab56---niwikujodamuludanuwuk.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078c689cc9e2---51438989997.pdfIn PDF document text
    • http://lmnn.ru/userfiles/file/sobularanoxe.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/39269719058.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/29361348756.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/17658193338.pdfIn PDF document text
    • http://grimastone.ru/files/foxit.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/jevitijufotareduxitevarol.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/37mjb62nacg3sp8s7l9o39v16n/tilenuzi.pdfIn PDF document text
    • http://waukeganeast1980.com/clients/877304/File/41946012500.pdfIn PDF document text
    • http://zerosquareonline.com/file/datawod.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/6ad123ddfffa6563da641f7fc5020de0/xeviwokiramuforaxebi.pdfIn PDF document text
    • https://austarpharma.com/upload/files/kagenakajoperasurazanaga.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/punitanixolozejorera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+learn+german+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_off00014555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D6C 10660 bytes
SHA-256: 7af338cacfc0749fbd0693359990b67545ba9f200b4e90e6a9041c1019eeebe0
font_02_sfnt_off00017599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17599 18856 bytes
SHA-256: 67671d97132b5457eac31947767e336ad550dee0c1d8997ce1ac42b0b6be5169