Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e548ec09dbec52…

MALICIOUS

PDF

82.1 KB Created: 2021-06-18 00:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f921d4099ec562666fd0f686e92426cb SHA-1: 87ded5ace649e97fa03ba411b131542607b585ed SHA-256: d4e548ec09dbec5238cb50e47a6e66ca918f30f3dc8d46dd9677991c5a658327
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malicious content. The document body, though heavily obfuscated, appears to be a lure for 'chemist interview questions and answers', a common pretext for phishing or malware distribution. No scripts were extracted, but the presence of external links and the overall structure indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/d115cd0bbadc3cf5a1131e9e80caf582/33000249512.pdf In PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/41979234111.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607992fe0c683---30683288850.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/n36t88tekiq0d5akqoe9h7h526/51706031370.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/3d1b7116096174f793997df36f0ccbf3/20528668106.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/qgghtf9b15o3o9hbs8m8ls90up/91011275157.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/07bj2icembsflsq8riofesnfr9/dogowelalurere.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/86aa9d7ec2135c350336002cb3c226f7/72489544394.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/37305771950.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097dd7674c3f---68333998081.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/98766564818.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f5fcc1abe785055bbf207cc915e1d817/nesive.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a20eb7302df---20697907069.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/nokoje.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/94c3e238b43ad7808b85687d1f10d954/tamopikebo.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/57129239711.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=chemist+interview+questions+and+answers+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5A 5432 bytes
SHA-256: 02738c0f7b31dbfb38e9c29b0382a67c7da06d38dd9f4d99d3475a224b3883f6
font_01_sfnt_off0000fcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB4 10484 bytes
SHA-256: ff0e829114a48268c591c250ce46dfb0e6dbe85891cdf3d832ab5a560be595e1
font_02_sfnt_off000120ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AE 17460 bytes
SHA-256: 85baab266f36a7931f67eeb8f76c2c75ca152365db2a597be77948a3cc41d113

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