Malicious PDF — malware analysis report

Static analysis result for SHA-256 59ed8cfbc2e1385d…

MALICIOUS

PDF

65.1 KB Created: 2021-09-04 17:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ca3a2e0ce713c1ab5b16c30067da2151 SHA-1: 93cc9e0ffb8a3ffbaab47218e9372e613296f5dd SHA-256: 59ed8cfbc2e1385d91265045f1ae09a606c419623133e8cfd61d284f8c8d4968
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The primary attack pattern involves tricking users into clicking these links, likely leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5661

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 https://catamma.ru/uplcv?utm_term=alif+lam+mim+pdf+download PDF link annotation
    • http://dui-antidote.net/images/userfiles/file/92984565499.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/wivotezetetaxe.pdfIn PDF document text
    • http://strandedtattoo.com/file/dogugaderafenujiped.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sezajagito.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/nuzeruxakeripibebiw.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/selulozejipex.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d26cf35569---tokibug.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/mdjuhck0lb5kc5fp7t3i0rbla2/48771844843.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/tavudoxunowuzogu.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/vesegopukunibe.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc25044d30b---38360849521.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608818a8be128---52762408330.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d4f2a486c---gisexemome.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/29181a9647f7d0c9c01876686cae3c7f/93462334301.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a26a6bb37d2---48848127121.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160832b2065b84---nazegefamose.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/kusavibevotesokamus.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8d88f253---nedavajuvipovigopotenix.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/0573222bf286640f7cf6ae5544d85fcb/fabaxa.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/99194950490.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160caff06b30ab---88090120330.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/bamubovutebena.pdfIn PDF document text
    • https://tavio.ru/files/file/pekebabogesujeviwu.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160dc3473c829a---80761971645.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1610e89ee0c266---77305568179.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3D 10228 bytes
SHA-256: c08f4e5dd3f4fe869001d5ec2ded215a9ff71779f5da8e18c08e20c4eb19799b
font_01_sfnt_off0000e120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE120 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1