Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4fed38237fa086…

MALICIOUS

PDF

68.1 KB Created: 2021-05-09 17:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f810fa6a4cb526f882adea8339e8e77c SHA-1: d06df0ee65ac000b3aa4ffba3bdc2316bf1acb4a SHA-256: aa4fed38237fa086b047090d8fa06395fb411e2b7cf10e5a7904c2bb63d29787
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress sites utilizing vulnerable plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The presence of 'utm_term' parameters suggests a potential SEO manipulation or tracking effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9719

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://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081eed01c4d5---varezi.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/7dab44db08e32178edaa2525ef04a53f/dukisof.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/372hfmgal3gjbh2j9gttmfa896/kodizusisunuxopiluwos.pdf
    • http://akicgiyim.com/userfiles/file/wozanemetukoxavosewu.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/ctolcsuobib3chntc6vjgjq0k3/19701065312.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/85dc2e647123f799c97f1f010a04582a/29264933234.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2ec8b7a55---tovimutoxaputil.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709d1e5347c---merafarin.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/ae409ae92df2a9a002ea8a177f049c68/lemelawamidirotuwagupog.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087117c13229---68926029833.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/3aa0b431469f3f87c7462ac71ad4ad4e/39442752124.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a02e21bf2e---nakenelamuzebazumokinat.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/335ef9088485e5b079ec8f8e7fdd62f5/palavesiluneg.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6d6e8affd---72937496434.pdf
    • https://artlabjo.com/userfiles/file/toxujirimezibilev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=church+anniversary+flyer+templates+free
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3be.bin
c9ab302a7ee323e9bb5c839d3b5c31fb86b9d0d79f8ae356525f229453990aae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BE 5324 bytes

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