Malicious PDF — malware analysis report

Static analysis result for SHA-256 37db96116dd0b073…

MALICIOUS

PDF

72.5 KB Created: 2021-09-30 15:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b610e25aef7bcd319e2005b914fd0ffa SHA-1: 1e6b4713b46225439267ce12d81eefd71954a5db SHA-256: 37db96116dd0b0738bd177d976ca8b4c0a71b6959c4c4f479d2a18ebb523e774
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to potentially compromised websites or disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, aligning with phishing and potentially malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://radekslodkiewicz.pl/files/file/zisumajetufudugikipur.pdf In PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/45260009910.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/semeno.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141445dd744c---tefokevekowoga.pdfIn PDF document text
    • https://kokomanis.com/contents/files/tubuled.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/10902946511.pdfIn PDF document text
    • https://snieznik.pl/userfiles/file/79438319169.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/puvajiwogowirufazotososog.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/7731993019.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373abd17005---98553428101.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/57449000038.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/vitifo.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/85497098361.pdfIn PDF document text
    • https://italvaping.com/file/26459376026.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/nuzuwuxukusifidu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614161f79426e---86063196741.pdfIn PDF document text
    • https://kueapem.com/contents/files/nagujasoxamotivofural.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/42017877148.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/46275488737.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86093404680.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/21cef03f1e3081647b4f0377f520b771/nozagazerifelif.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/bavofazikuvaxejatuluz.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/mawofo.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/zikarusowekegefezuzew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=best+live+weather+app+for+androidPDF 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_off0000b4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FC 18344 bytes
SHA-256: 0436d249175319a44a56f1516d62a0d9ac84c94f0f653cf3374e506421e6437b
font_01_sfnt_off0000e36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 10800 bytes
SHA-256: 63d4dec16f4f5e4011d6a607609f3b3fec808448e12c25532eff02796831fee3