Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5d8b8897f81816d…

MALICIOUS

PDF

73.9 KB Created: 2021-06-13 20:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1a0e26ffca421b49b904ad1b4a9adba0 SHA-1: b8fbf0fd65cac4f400654ba8d912e6071a4eb666 SHA-256: e5d8b8897f81816d415a7c0514459995e80d310b76411e2ff8eae8a1aeb86abd
156 Risk Score

Malware Insights

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

The PDF document is identified as malicious by ClamAV and an ML classifier, and it contains numerous links to compromised WordPress sites. The document body, though heavily obfuscated, suggests a lure for "Ms office 2013 for mac free download with crack", indicating a phishing or malware distribution attempt. The presence of external URIs and link farms points to the document's role in directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://oniceh.ru/uplcv?utm_term=ms+office+2013+for+mac+free+download+with+crack PDF link annotation
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/5dee8840600847b8dd859897f328de16/19989575256.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/65a9b1a0cf4e8084aeb032d9c020c071/28503090795.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/petusadevas.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/64018929261.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092956af3240---85830622644.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ce8e00bd11b57ced41a7d919c490c63a/59186935601.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/wezurukizufovo.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d50e76b82---52459462818.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/77dc34891a534adefcc58b3481e89d40/lawirunixa.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/f4f86c5a080c3db306b1a23f6b6e8d50/28308940245.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/5272680545.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/61u7i8qqo8uud1ttkfe1a8rmt0/refifodutexokewonivezajep.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/71265966331.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/geselixoxekodaxumufemo.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/bukopipoj.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/25784896159.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/tikal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE288 5912 bytes
SHA-256: 2b4520bca60dc2a549d81d7082e9d80c8b6839d8d93ce76818358bf980e068c9
font_01_sfnt_off0000f698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 10552 bytes
SHA-256: 8b2807a380d9f08dbc54ef8f13954a5380ad453597027f2066a3c4c076dfdee6