Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4a31e944af8c8c…

MALICIOUS

PDF

74.9 KB Created: 2021-06-20 17:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6078245745aa5fdd7e17251a6344b5e3 SHA-1: 9c841b6ae68ab4786ce8862d354cb21ee596b393 SHA-256: dd4a31e944af8c8c29a6d4d3ee0f90f928387ae60cfbfcd488af786333f7c483
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute further malicious content. The document body is heavily obfuscated, but the presence of URLs and the heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9894

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://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/da1781e9ea5ee55f9d02735d489f4a29/85802940851.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/92fafcbc1951ec91877c41ac04777b43/63092340170.pdf
    • https://pottoka.info/files/galeria/files/48528649589.pdf
    • http://naturabliskociebie.pl/userfiles/file/lelaxewewanigut.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/qof7q52i9i2i3oru7n0icgma1q/xowinebegevamoberig.pdf
    • http://cancercareresearch.com/userfiles/file/dajagova.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160764d339fd54---muguzakefopuvu.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f2bc9a36f3d906baa1ebbbea88a34051/divuxovegudosasubanur.pdf
    • http://applexin.com/ttpsea/files/file/23178306312.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/hl71pt3tds0iiboktro0662m07/49512235819.pdf
    • http://yachtandgulet.com/userfiles/file/wozadomuvoduviru.pdf
    • http://cungcapluonech.com/upload/files/96315132444.pdf
    • http://curry-box-deluxe.de/userfiles/file/91871083761.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160838af787636---83448949848.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b49a1401797---xumuzadixipesonixaberino.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4d30a72f6---dexafeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=play+offline+dinosaur+game
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb11.bin
c23858148d05c20c2f716c026492f43691f5785feab1310bec5f8639f98053d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB11 5328 bytes
font_01_sfnt_off00010d29.bin
f0e83d9bcc600044d84609a57c23d061fe20e12ccad5fd8ea4d446c5fb5a68ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D29 10964 bytes

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