Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2e55048de4d51c…

MALICIOUS

PDF

76.4 KB Created: 2021-05-02 10:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fd7f372ca499f16ee99f9e48401c2fb8 SHA-1: fa2477134ae49bb17caf893efb6ff1ce3ff64758 SHA-256: 8c2e55048de4d51cc629db7ab94e4c0b49adeccbb44c84e989b5d29f06d9f8d6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure victims to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://alshaabcoop.com/userfiles/file/lefobejifafe.pdf In PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a5c56b154---31598652762.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/25f08e5338ae517fe4a7306f62b585a2/sulovigujasupawo.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8e196b32a---6726345551.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/63cc12b2a090f6cdeb04fdaf289de32c/mewemore.pdfIn PDF document text
    • http://ashioke.com/images/library/File/53220856021.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/t2gu5hhmu3tfssstc0vqlnig97/fepiwoxik.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfc707b6ce---67135493352.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/67774397335.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/766cc49eecdfe9ded29b902bddd290cc/debif.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/5809251114f9bd43a1ad281e3e235ffd/93099147594.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfb7c5d8d6---91272764793.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c861e65117---risapuzaberugozadu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a88f25b951794a28c37ac3baf253fea2/zijam.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/jixuv.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/96f036a8b9bb88ec28c78248793120fd/nebaxi.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/0943296ea25c7781c5d0282b70156e68/24927426246.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=adanga+maru+hd+movie++isaiminiPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F1 5256 bytes
SHA-256: eb033a1b5f7f1a8e1edbe193ee80eef557d1dcb2041ca8080fcd02c6bafd43d2
font_01_sfnt_off0000f4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AC 1936 bytes
SHA-256: 73983ccd477f0e4c07634362c0f9f13a23cea415a26bff37f7f125d59a681190
font_02_sfnt_off0000fdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEF 11176 bytes
SHA-256: ba9e77cc5c7a0d1190a305354afdb4894470dc4a18ceed7802836d17af000b63

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