Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8f045a670ff297…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 22:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7442d4262a138ceb6050572d3d5f2463 SHA-1: da6de5cc5daa5f4c60979682a82c4ba7269149c0 SHA-256: ac8f045a670ff297a478515a991b69c7e29f3d3676d6da0f60f914c775e71e9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://queure.ru/uplcv?utm_term=cours+droit+arabe+s1+pdf+meknes PDF link annotation
    • https://lesura.net/userfiles/file/nawatagugojobepovabi.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210701070203.pdfIn PDF document text
    • http://hodori247.com/uploads/files/gafipekepumuma.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/51294319419.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210624230520.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1609c71a275e67---60887103231.pdfIn PDF document text
    • https://chp-travel.ir/data/file/53485272576.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/6b53126c03694f67f472f81ae09ad09e/xigurotupan.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098365faee89---35645192022.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/6465333075.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cevjm2gemgvjp21vsqqsrhifd7/riweledawer.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/ftm74bn79nv5tu2ai5i2fenn74/tekagizakozilobuduxad.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/tegedinajo.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/48078264077.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021062014423770554.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/tupeb.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/deboxegakerunis.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/96315410475.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/7c18d7716543b9f1d8b37d42d8f5ca81/kafas.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/10894452736.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca2c314629---47626833333.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/guf48c7atjinaf4ermu20fhid8/59976091036.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/fiwetobefesizuveba.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765e796ce8f---56359361947.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/7nfbaprgcc0hqag2gfglscugu0/gipanozuxitaveponep.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090201330131.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_off0000d1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DE 21952 bytes
SHA-256: 26db0ff168f90f68ce57c457ac90195d4fd50155d5b28c3ce8b25366e7507b0e
font_01_sfnt_off000109d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D4 11028 bytes
SHA-256: 25b0e27caacbd1b4644070444f897973e8c0cfca094fb33be093cc3f60526c0a
font_02_sfnt_off0001235d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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