Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d3560c555359658…

MALICIOUS

PDF

63.8 KB Created: 2021-05-11 22:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0789ef83807b3fbffdc1f7789c2c5d5c SHA-1: a35b5dca7dfd83e4c44bcb3ae2a7aa1092c89214 SHA-256: 1d3560c555359658d95a3af71f4d586722b6ce20670dd0ce6b403cf185d301cb
154 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8608

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 http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c0317e32---zadavewojasi.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160819d141b68a---21115196843.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083940bedda1---fafezuwawogeselulepunubi.pdf
    • http://banghetretruc.com/media/ftp/file/lagorunime.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4d7b159d7---gaguriluzijafaleg.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777b1e5740d---womorode.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b298ad6a94---sidelege.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/qv7d8pj12i7nr3epnhne06ggsm/42238932859.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2a39e8763---40445526595.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/d31d99fc0da4fa3746b1e6b3c53b4ab1/pivixokezekawakamaw.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074148d78547---50979229259.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/372d4d171b9f9321646b4802fca9dd36/39355675342.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7592e4a68---nibikorexofagox.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094ab3767861---sotikumananefivi.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160796a8f699e9---17805286479.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=facebook+messenger+dark+mode
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000e7a9.bin
16447b4eb80412d7fee759ff17eb9c2b73e66bc8ecdb8722ff0925088c470a58		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE7A9 8716 bytes
font_00_sfnt_off0000d6be.bin
a35fdec886d31b90062bfd8ee842b8bedc0982362c0665b0f2485bc19847ec2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BE 5044 bytes

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