Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca2c918230f25b3…

MALICIOUS

PDF

88.1 KB Created: 2021-07-07 05:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 34be534ebe0aa77e33024f2b4fbc437f SHA-1: 7787bc1bed668f118efbb9509e4f6c8ea75464db SHA-256: 4ca2c918230f25b360604b693f833569d24aabb4ccdecb1548f2d2a34322cf41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a malicious PDF detected by ClamAV as Pdf.Phishing.Trojan. It contains a link farm pointing to multiple compromised WordPress sites and other domains, likely intended to host phishing pages or further malware. The PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/583ee824ca7a543d55a5943d0584224f/84339127757.pdf In PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aeac30282f0ce95499cd69e39a21d5d3/xikilevukulazerutelanojo.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/91249861988.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/2759208095.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/noidctnvsbmo5gbml8bb3qfj22/tekowexiteribagabisof.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762856d76d8---53145850824.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/jesifegibuverekexafuver.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d57398cd325---1249173726.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/45a738a2f3a45019ea5e311e0627cee3/87791548377.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9406370ec4---fefuzekavuzijetoj.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/72837835187.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/7588533177.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/18717699871.pdfIn PDF document text
    • https://clinic4lab.com/upload/ckfinder_temp/files/20210618095953.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f54b86257b9999fceb9cd56166d7d4c9/nujavonapadozapib.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5efae14136---18165787536.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1b98f00d1---lipimitipa.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/gepaxag.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/68316164205.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/18051021979.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b8e323824---dujewabekaxosete.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/710db99c5a11d38e9649aa907d24cd4c/30919490076.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/82687159084.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ce965bb8a0c---rajamivulekabivo.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/63351709202.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/21700275432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=auditory+processing+therapyPDF 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://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_off0000f67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67D 10944 bytes
SHA-256: 60cbf81755308acffa2bb00d05c92fe5c7ee754b2f366cb4fc06c28472cf22a9
font_01_sfnt_off00010fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA4 16664 bytes
SHA-256: b21f12ffcf2cfc7cda71601c84621daedfeda470840730d520ff6394f1fcd9f2
font_02_sfnt_off00013b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1