Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f59b6ef44e9ef68…

MALICIOUS

PDF

79.8 KB Created: 2021-09-02 19:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 60cf03f3f974f43e3d333045488821ce SHA-1: 09e6045b5eec2e97ac1d8d4898ee9cd69c4ed55a SHA-256: 3f59b6ef44e9ef6810c2074d80dbef1f233776aae9f871b3977fc64457c2e731
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content or phishing pages. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/28287599574.pdf In PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/99ac3420652a629e2eed17928d2c7e7e/18016168074.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3e5c1308b0eec334743b5d622e5d28ca/sesufobalirabexokev.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/20266708680.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/13618628793.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d34de9a051---fizijakuzuvupukitawu.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924230cf48d---nofalaza.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/sojezakogazedemirizef.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/sobovoxufedi.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/88566274701.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/52154248273.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/ligemigijadoniselav.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae911341df5---64132083991.pdfIn PDF document text
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/jaduzobuzuguvawevosemeguf.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/9a055d7b38234e48db05901f91c3f64a/83249634216.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9d44591f6---68883634280.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31fb2abaa5---66017833991.pdfIn PDF document text
    • http://waterreducer.cn/d/files/ponixiwabifal.pdfIn PDF document text
    • http://rc-modeller.se/images/file///82128202465.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef4765d282---vonerezabiwotul.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/4296161200.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/tanalojelesuwo.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084d130342e8---80154149632.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/96598891897.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/b94430752798cb0e9b3807799ec79ebe/8219231765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=mars+condensate+pump+installation+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_off0000d31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31E 10768 bytes
SHA-256: c779c816c6e87295d6dbbf21ca5b48ce1a0563c9f59191463251a008f7063ea0
font_01_sfnt_off0000ebde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 17580 bytes
SHA-256: 762c70f6b38fe758fc0eae814bd466d765f2d5151ff646cc8fbcc6c786e29096
font_02_sfnt_off0001194c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1