Malicious PDF — malware analysis report

Static analysis result for SHA-256 94ec0c4a15cfe587…

MALICIOUS

PDF

71.8 KB Created: 2021-09-05 03:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9316b173b559ff1dc9c1d2da3126601c SHA-1: d29934722264fb72d6bf71e8542ccf5f04a6ec0f SHA-256: 94ec0c4a15cfe587537ecf1798fa8334aaaf93066bc2cc9069f439d7af12f9b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the nature of the document as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a27ae9e226359a2d1a6d15baf1efc139/kisesotefefuxoge.pdf In PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/0f76cfb3925ce2129ceff0e9bbc12979/8634932506.pdfIn PDF document text
    • http://bakoca.hu/files/file/61810805498.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611dc760ce091---99834950271.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/93863443315.pdfIn PDF document text
    • https://carlojans.com/cms/file/15007889036.pdfIn PDF document text
    • http://absigorta.com/E/file/48029104668.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b16109d77f3---fimabimijapavawavozat.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/63459383739.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/10029751678.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/56334331702.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/57699949493.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/9754139513.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160723df801f7c---fofekeroponatubewimoxof.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f207a1bd2---54592032064.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a36d25ba9ec---98387348114.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0baa97ae---3289064242.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070f15879c50---38229729252.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/mosomanimamosavajuxo.pdfIn PDF document text
    • https://usdcp.jp/user_data/userfiles/files/87866166647.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/50878935953.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/wodazimiwarepiwekobov.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160839c9d60ac0---88544007444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=inorganic+vs+organic+compounds+worksheet+answersPDF 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_off0000b70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB70E 11208 bytes
SHA-256: 6234a76dc8da844813371228793830746a91e9138c0eb9bbff7aced279493371
font_01_sfnt_off0000d100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD100 15600 bytes
SHA-256: ea6400675cb21fbe4e07e6911343a6b25b40c54caf972ee1bca905a881359610
font_02_sfnt_off0000f8d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1