Malicious PDF — malware analysis report

Static analysis result for SHA-256 c710f17dab66d16f…

MALICIOUS

PDF

64.0 KB Created: 2021-09-24 10:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 523b5bedf9459aea6e22a546211bb00b SHA-1: 2f42a96b3cc5260b33df2565f32d002ecdf82287 SHA-256: c710f17dab66d16ff238d4e04b11bf82399705760fac57cabe7e0c9dd5024a43
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The ML classifier also flagged the PDF as malicious. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7025

Heuristics 5

  • 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
  • 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://delve-cr.com/uploads/jilibopidigosomobedafasav.pdf
    • https://habibitours.net/ckfinder/userfiles/files/satabevireporenu.pdf
    • http://mvdeastudio.it/userfiles/files/vasesoxepivegowajufal.pdf
    • https://biocoils.com/img/file/rutidewimuweferilivo.pdf
    • http://jamalcar.com/userfiles/file/91520431759.pdf
    • https://sapsda.org/SapmaUserfiles/file/1947217953.pdf
    • http://litho-and-co.fr/ckeditor/upload/files/xelifoxi.pdf
    • http://studiorapizza.it/userfiles/files/xotabaxula.pdf
    • http://alwaysshine.com/fileimage/file/vojudiwiwufi.pdf
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb4959d4fa---21484058289.pdf
    • http://perksys.com/userfiles/file/58784801611.pdf
    • http://starma.pl/files/file/ginit.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/c1f1669272d2255a1377f78cc243d0bd/judupijifefin.pdf
    • https://cortopolis.ar/userfiles/file/7889247018.pdf
    • https://costabravas.com/uploads/localidades/files/kilafok.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/173806e4bf32658974260db7c2582d18/kenoluruwugizuzodanem.pdf
    • https://asztromiskolc.hu/ckfinder/userfiles/files/wupivoluxokosoruvobemam.pdf
    • https://elemonbg.com/Files/File/37990580291.pdf
    • http://massvt.sk/editor_uploads/system/files/46510790747.pdf
    • http://www.asiacoservice.com/file/files/soliniwovevulivinu.pdf
    • https://adikkedua.com/contents/files/41457998664.pdf
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/23993441351.pdf
    • http://liderzy.natura2000.pl/imgturysta/files/kajov.pdf
    • http://dongzzang.com/userfiles/file///folelefavewajegat.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=mega+man+x3+zero+project+4.0
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db17.bin
60ced9e7d3702b01cdc0a4d501aaee68fa09bfddcccffdf6c1fcd35e2e129c91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB17 11136 bytes

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