Malicious PDF — malware analysis report

Static analysis result for SHA-256 057c2852746f849e…

MALICIOUS

PDF

65.7 KB Created: 2021-05-04 07:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1b8d2542c68eaed32f8a4760e6fc956 SHA-1: 59a2c19b1150f196352b1291f2899c1cec46af7b SHA-256: 057c2852746f849eb6a47313291f6dd2e078093b6aacd12bb165b2761cdfba4d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8600

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 https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/2d2ae4a217da1ccc471e2e2158cf81a4/xaxew.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088a73c0efee---81176923972.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077988e5bebd---56447207290.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/18b341b22e55efc44913b32ffeda58e3/79892261955.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edcf46c842---fakezikukelanulak.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/0af9c772de1bcbbbe00e36fd5bfb22ec/90342778061.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/5c4a6834ccd3a68aefe3e0ecdd936a4f/13902023290.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0e7d7efd7---liwimamip.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/119dcf0d537d5ded78affe9525477cc7/53481125993.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/5914ca096e998b96932672a1c2127c21/mesemufe.pdf
    • http://www.urbanwaterways.info/files/39184050476.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160889255b7195---77141835154.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ed61425d3---75869371106.pdf
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/hf66nv9cifdfjmst17o4s3i0m0/nawesume.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/d8dceb99f94462443e89f5cb3db8aff6/tirexujewegovudefes.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753bda152f6---18584717752.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c05e5bd1b---27933840335.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608372105ad1c---sutuza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=best+hd+wallpaper+app+android
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc5b.bin
62931dab0904f3021ba057573c093e3a7d2986c4fdd8b35bdcc7285b4e0af4bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 5188 bytes

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