Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f552f1ce7fca521…

MALICIOUS

PDF

77.5 KB Created: 2021-09-15 06:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c12e918e4951a77c541c43b43c499c81 SHA-1: 8bdc3afa8290a6e4d9af027167176d5685c365d3 SHA-256: 0f552f1ce7fca521c135242f8fe18efa37c5bf40c7210248831d6d80e585826a
156 Risk Score

Malware Insights

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

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 containing numerous URLs pointing to potentially compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://redeyeldn.com/userfiles/file/ledamekejav.pdf In PDF document text
    • https://rcot.org/userfiles/file/45114785557.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/19310219265.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/bulodorusepivemoj.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161314429e99c0---duzufovasuga.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16130653f4d3a0---rajimosigulapafivusiv.pdfIn PDF document text
    • http://lagrupacio.cat/file/zutujapemejivirapozo.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/jinetekigubejobubenuzon.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/raniwiwelo.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/41229370991.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/35783235612.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16131ca3a53954---72009708344.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161410e6b48bd0---5799158959.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/neronovigiwusomaxusula.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613275bc3aeeb---64049492120.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/42041464523.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/mogabidow.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140341513d20---10022691498.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/kd2teu4hnrf6p18hmcfvm52atj/dorevunikaxitadedefesevu.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/fah5n3cfo6fsbd1ommq2c77a92/44750435698.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/46181341710.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/11916802521.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9390f055e9422c0e66f09f57b27fbbcc/weborirugake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=puffin+web+browser+apk+android+downloadPDF 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_off0000c038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84A 20548 bytes
SHA-256: 0bebefcf18fc3868c839fac50bbaa89f9037d448c0c964f9636695ca43fa6194
font_02_sfnt_off00010e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E12 10812 bytes
SHA-256: 8d86b4ed5c8a10ef4b46920aa46a3df2b355dc7ab12359da1eedb4b2edd16357

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