Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5044fb7e71b735…

MALICIOUS

PDF

99.9 KB Created: 2021-09-02 15:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 23cbd60f6749abb5c77da003700980c0 SHA-1: 8491c39004d0c90f067464c1a0725851fd14e769 SHA-256: 8b5044fb7e71b735204f363c114ab070ef475f41b7a282b9286cf01f599c7ec8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5847

Heuristics 5

  • 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
  • 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://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a404f6b5f33---fofideruruzama.pdf In PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/7smf09ac106e1cubl372jb977v/18355674307.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/67538161855.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2cca20e94---70268124080.pdfIn PDF document text
    • https://angkagenap.com/contents//files/47238168322.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/23353068321.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f59c2e259---50982901790.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b69f1fa5c---wezalalogap.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa67228ac1a---50458669885.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/42e1dcf0991dfecdf61f55ec8ca2dfd4/57607970054.pdfIn PDF document text
    • http://hncastlecable.com/d/files/gagavakin.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ce7a55f14---87834047606.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/45977022439.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d48c5c6b2272520afddf848afde5d19e/65028626012.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161069e0006a02---letogekeruse.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/732764325.pdfIn PDF document text
    • https://kawanmto.net/contents//files/dagejowegekaranitadesowi.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/5aa8ca0a89e6d6003266025331ab853d/88157561851.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161259f0d128e7---67071202724.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/03gni6dnp4vs0aub7c0ivrln80/sufafobazaxubezosedik.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/27852746234.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5d87f04b3---wonogilulofafuxu.pdfIn PDF document text
    • https://12waktu.com/contents//files/76331355333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=conceptual+physics+chapter+31+diffraction+and+interference+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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