Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e3c48b2f34621a4…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 19:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 225e0ce119b6c34364f3d210a1d07f80 SHA-1: c4fc7d095df46aa9f190a5fb05ea5ff987fee36a SHA-256: 1e3c48b2f34621a4ddd7674c9b4f334c96c29ff93a632132eae1db75df13482a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as a link farm and potentially malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous URLs pointing to various domains, many of which are likely compromised or disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to malicious content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chiataiec.com/userfiles/Proj_Name/files/wojirepobuvimemeripenup.pdf In PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9443491774---61266966283.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/69820944903.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/gofobanomawizepopanov.pdfIn PDF document text
    • https://theurbanthinktank.com/files/54620901795.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/18014275508.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/36822020517.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/rv26j3hq3sk7b69n653qabqs2j/62928700654.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e25250abb3---mitenax.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/65678412908.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/3a03a82f8f6045863528e784fd4fee91/14758891004.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/mebepuxiwowen.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/19201855914.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/dobexofuxar.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609df096b879b---nedugopuramurimawovu.pdfIn PDF document text
    • http://www.bash.cl/media/file/10430579753.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/95563798099.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/tofalapewi.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/97119650354.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/52982306509.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/dupasizibu.pdfIn PDF document text
    • http://cecev.com/stockages/files/kexujoresorifuf.pdfIn PDF document text
    • https://badrivishal.com/media/78783110885.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/kivk6oda9maslg17a5epp2j96b/39482008678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=5th+grade+algebraic+expressions+word+problems+worksheetsPDF 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_off0000de61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE61 18188 bytes
SHA-256: 301a9d0e51074919191caa7767a2d0d9d475419876f7b37db0c55c0ba644061e
font_01_sfnt_off00010d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7E 11420 bytes
SHA-256: c5016a07e0529a2c56ac7c68d58f0ad68fa27647d50e08a6c26b2f040552ea98
font_02_sfnt_off000127e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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