Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f703aac5ac0367e…

MALICIOUS

PDF

86.9 KB Created: 2021-10-13 08:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: cd8957a488a9ea6e4acca8b5f651cac9 SHA-1: 347a66224fc9e4e00bfae28223668b86f8da0233 SHA-256: 4f703aac5ac0367ec8217c58b559fab1cf2d828b025cd0d6367525ab48ba0b8a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies this pattern, suggesting the document's purpose is to drive traffic to external malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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=pluto+in+virgo+12th+house PDF link annotation
    • https://metricgroup.it/uploads/file/gukara.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/45948217800.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/95066792520.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/32083783229.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/1437364158.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/36790635510.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/89d8b58f49356a1f09ee0105f80f33a0/7663434927.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/70291669821.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210919193151.pdfIn PDF document text
    • http://intertermo.nl/userfiles/file/gebivitilegal.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/10548645361.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/savif.pdfIn PDF document text
    • http://gynekolog-zilina.sk/uploads/fck/file/fuzonozumotusezagixagi.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/sunimenixufeselezefofewem.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f18f71b421---4316035992.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/zevejidimonizobopikusoj.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/67900788620.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/64346009192.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/10691267744.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c6120dbfc517a4a2146b1d18629f6bcb/73940688278.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/zifupumulokulizuzot.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/pozizereleg.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/614a787a7c3ae890c007dd97467beac2/18331292003.pdfIn 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://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_off0000ee3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3D 18884 bytes
SHA-256: abbee9ced1fd2d6f524019d14f4bcfa58cb528dc4d151d3d5c1d02e8ddd5fc8a
font_01_sfnt_off00011ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13604 10564 bytes
SHA-256: a921ee3d64cf002a016aef6d6b0e916d8e5f08905344e8f78fca34495af5dbd4