Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea719c30abb6e7c7…

MALICIOUS

PDF

70.9 KB Created: 2021-09-05 16:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a868a861addfe025a07b9eb8e8d6ff85 SHA-1: 6afcfe1011fccade6286b6c5017420137c2db18a SHA-256: ea719c30abb6e7c7cf73b0001a6ce456f9df817acaff8358535467c2fa5af46b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while numerous, do not provide a clear second-stage payload, but their nature strongly implies a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf1edbcb7c---jilomokaxolefu.pdf In PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/88cd853ad5e26de9fa92ef484e5a6aea/78584521600.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc589ceb50a---nuvavuvubajepiterivat.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/kexinipifobavuwutus.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/25228927092.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/26009884905.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/3739271252.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/31510612627.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/satexeliwudiva.pdfIn PDF document text
    • http://secretinvitation.net/images/files/79280185931.pdfIn PDF document text
    • http://gibisch.org/files/files/korin.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/fotavixadasuk.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/7b88d7a57e805692d33b49e1440eb1f4/22414417782.pdfIn PDF document text
    • http://wwstationery.com/files/file/pofizabuzopumizidafipiwe.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/99633068601.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd3b785f0d---17682850242.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b12a94f54---kigefixesemusotulixagim.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/236f615207ff5a36e06da85896b33ee5/volomewoboxenorek.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/2069049384.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/17979760964.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cd72e0e2f9f---zananebuja.pdfIn PDF document text
    • http://grupophi.es/uploads/files/vulefotuzikazevo.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/famujumulorirepodagedexi.pdfIn PDF document text
    • https://camelcarpet.org/d/files/8298621810.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/ti36sghv6cp4rbd9j64k5s3tp3/14012409177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=note+taking+worksheet+magnetism+answer+keyPDF 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_off0000b5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5D5 10776 bytes
SHA-256: 47d796d29c64d815d373b616132a38a76f5a67a71df2cf233d893d04817eacc6
font_01_sfnt_off0000ce98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AA 15232 bytes
SHA-256: 9806d30352e93379faa6bb2001649746593fc4d630ddd185e6f87cbc91282b59