Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9b1df06863824b…

MALICIOUS

PDF

95.8 KB Created: 2021-06-19 06:19:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7b3ebe1dbfb84312f241b72fb3d6b1c5 SHA-1: 79d6341acbeb7f430ca56575e98aed6bd034dcaa SHA-256: fe9b1df06863824b7820c9dcfa3fe62bfcbd035082da3020476a4d2bbbf35087
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for redirecting users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • 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://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078569556a92---voxuropenezepimejemuxefi.pdf In PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/lukukeponojegatobu.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/7dfde16530cb10271e80c13a4a7b2ca8/31465093101.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/65787712969.pdfIn PDF document text
    • https://melz-feu.ru/upload/53244600292.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7eda19e8d91311dc3ae49c0c3c9fdf98/24240234478.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8746581c56---tafixiruwavi.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16093c3147b9d8---62603895255.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7a34289f9---ragokanipelegixa.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160772ce285950---38979339487.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/65540669669.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bb854a1091a---xidodanopevadoginumol.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/sl2fskhla660n5d5b4h4eu0k67/sujani.pdfIn PDF document text
    • https://webmenuplus.com/images/file/44991074530.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079ea6d9b712---78204239132.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=monster+hunter+dragon+piercerPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B90 2876 bytes
SHA-256: ae59d5040d9577c51f64cca129d415d8a9ed97c65b7bb3c7845b0980d014a663
font_01_sfnt_off000115cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CB 5188 bytes
SHA-256: 71182e4a8c2df90b0694f625dd8d0591f309c303437b51292f13006e577cc3f9
font_02_sfnt_off0001276c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276C 11132 bytes
SHA-256: 5420011b3aad7e0fc2a5b7acbddc9505071a59a7b792ae8c3deda7d178bff94c
font_03_sfnt_off00014d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D9E 16188 bytes
SHA-256: 4cdbb36ee52757e769bbef7d0b50b55b3498df96f7d93558da1ce64081725b61
font_04_sfnt_off000162d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162D5 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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