Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e7ceacefb5bcf8…

MALICIOUS

PDF

75.5 KB Created: 2021-09-01 20:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6b69fffc6460fa92ab03a0fd26a71c21 SHA-1: b640d0396e78b296898b896344e62b4637312ac6 SHA-256: 55e7ceacefb5bcf84464fefb8756ac64ce3b022c57044f9c851837a6181707f7
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 potentially compromised or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The embedded URLs suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.cenlaenvironmental.com/siteuploads/editorimg/file/xinare.pdf In PDF document text
    • http://aescantabria.es/upload/fckeditor/file///75280488794.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sefibewejalega.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/wivopogu.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/66675054527.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/kamoximaxavo.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/pabatexo.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609ddf49bd7fa---49062578317.pdfIn PDF document text
    • https://hoalavender.net/upload/files/kakefufomof.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/xowebevojuxiwebafuj.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/750281517.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/jifovaboza.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeba9cf882---legelegekanapuginipara.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1653bd80f0---72442844600.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/71909495180.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/11955304945.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/vulitusulidomenozofuvude.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/f42fedd44cb1451f58254d5b7a7756ba/lajakugusodewujumaxa.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcb5582945---xefatalusumig.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/zeregikenozilogiro.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//47484740907.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc7ccea90f---49896415515.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160763ca657055---dunurinufasuvobek.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c010cb45e---36763191083.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/pomufuxox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=abcd+tamil+movie+download+isaiminiPDF 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_off0000c17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17C 18052 bytes
SHA-256: 123b70a8567e103160cb1395e20188123fb07de0738fa803f3be2d23eb084533
font_01_sfnt_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AA 10704 bytes
SHA-256: 8e9c988a6e45b3b65f6acfc0bb1497d1e6977f1a699392618003757b4a5661f1