Malicious PDF — malware analysis report

Static analysis result for SHA-256 18bbbce3cd9c7d53…

MALICIOUS

PDF

56.3 KB Created: 2021-05-21 00:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a99a46200eeed33b0c96ed7beb2b263 SHA-1: f1a745b19600d4c6da7e82fda570689d640db897 SHA-256: 18bbbce3cd9c7d53e784fa0b49ea3f497d7550328e232a1811156e144dcd750c
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm used to distribute malware. The document body, though heavily obfuscated, appears to be a lure related to educational materials, likely intended to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8411

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://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607de31ef0847---93887676291.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f41befd6d24c0822e16c1ae93d5e394c/3204939479.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b741fbfac5---devitedesefo.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ec42b1b57---jemenilodujukemeriru.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/15003255394.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bd4a90ff1---90135277966.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160868e8a6caf5---84162533857.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/315548f634ca77cf11c68f66fa37e7d5/60460829357.pdf
    • https://heatingboiler.ca/fck_upload/file/42894466984.pdf
    • http://taxicityplus.ru/userfiles/file/11474261843.pdf
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/6fd02a0f8b6cf2c0e5f8454f19740fb5/jupogax.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/d272ab03a65422c38863657d27d92bcd/kutefegabeme.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf15c0ab1b---37863804778.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/nddv4lc374h2qqi0aqrn0bph4n/repiduluwawodi.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/494886fdacbfa40abcf75e83d4c3128e/rajarej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=solucionari+llibre+matematiques+1+batxillerat+barcanova
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0e5.bin
95f1d31a81d6e4c96b47a3673e598c4f8873a28437436c5e7ba9f65a5130aa6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E5 5492 bytes

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