Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec068d7fef14aab…

MALICIOUS

PDF

77.7 KB Created: 2021-09-22 18:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 02af91b413253b66bb498b3236e2003d SHA-1: ceba73fa1db5f984546a69ef05a78bc9547c63ab SHA-256: dec068d7fef14aaba9807e8eda54529eff8ec1b50970deceaf46cf37bc3467af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the formcraft plugin for file uploads. These URLs likely serve as a link farm to redirect users to malicious or phishing content, a common tactic for initial access via spearphishing attachments. No scripts were extracted, but the structure suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16149c00f4a017---xiwaxiwireforuxosetaveg.pdf In PDF document text
    • http://kasaitogo.com/uploads/files/xuvotemivurege.pdfIn PDF document text
    • http://generoussecurity.com/uploads/63547871598.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/gufebiri.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/dimivigewi.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/paratuzaju.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab15d0c400---85003785211.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161430b15afd0b---57625066593.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/jumojoralu.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/58032005390.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/13936644259.pdfIn PDF document text
    • https://noventa.cz/media/files/file/fazokakaladenalulekafoper.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161491e4574507---58232768057.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16142cc344422e---88819808626.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-15/20210915180837680853.pdfIn PDF document text
    • http://client.diffuse.info/files/kegetefaxurogano.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/72825784458.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ff9f468b1---nipumilodukejugexidik.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/03brrnvu91mlnp3tlktdjn8ff7/45710169456.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/vajivolurewubugi.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/19078696825.pdfIn PDF document text
    • https://renault-service.com/userfiles/mewizijefajulekojorub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=digestive+tract+systemPDF 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_off0000ce0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE624 10484 bytes
SHA-256: d1e93ad5f7d26f237d0ffd9d2db18da82ef378e9f9238d6f0a11d327ec80a7f8
font_02_sfnt_off0000fe15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE15 16688 bytes
SHA-256: ad359b534df184f1813f86f809b4fdde75f4cecbfe31ed0bc4cb1ac05c94125d

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