Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea4cf493ba5181b…

MALICIOUS

PDF

95.0 KB Created: 2021-07-06 16:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 19875030f2776efc4bf71319db60602e SHA-1: 7c5776cc6f4a48017970859acb697b7701e606f3 SHA-256: 8ea4cf493ba5181b1ce4a80f1f2b4ef91914ff78bd18a5add2b2d8b2630725b6
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple URLs hosted on compromised CMS uploads reinforces the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/j4rsnn7k3oj9pi54c5n58ev1jh/xabizoxisotupejikor.pdf In PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/c687f60ea2763815036fc3c2ebb8ef76/66398628100.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072728e04588---29311767602.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fb8d559f6---41083777541.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704a1ae39cd---51558876103.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/solilofazamonixar.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/jovulabolo.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/6d2e8e2c05c63c003058888af4c1cdb5/68656764440.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/41790445431.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/72002426024.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/f07b723d1bf2c0405b398fc6aa86aec6/75695932769.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d23369065a---97966334246.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/96a3f2da5bdbd2487bf87146850192bc/jakapafixafarugepon.pdfIn PDF document text
    • http://mitra.su/uploads/ckeditor/files/puvotudulewolipufako.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c3d84225c8fab4319768196d6a431479/zelufativipugi.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cf034c77b---nogasagapixiwadiwit.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/43786461789.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021070202052097.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/63364775318.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607670c611f61---81888121928.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609297ae07fca---zimiv.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/sakapatalepaxawiwo.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/b4dba587b081ecfc6ebcd7cd7891a92e/xagifof.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/zinifes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=customer+centricity+appraisal+commentsPDF 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_off0001117b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117B 10780 bytes
SHA-256: 5c97a03db163941b3cf71e68a39723890f85f98ecd37e4adcc30b16042fa321e
font_01_sfnt_off00012a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14272 16988 bytes
SHA-256: 346a0f4e49b921531ec383559d55baa803f3a1ceee64628a17d830cd8a1ba8d3

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