Malicious PDF — malware analysis report

Static analysis result for SHA-256 c62b7bee96130a9d…

MALICIOUS

PDF

94.9 KB Created: 2021-07-07 01:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c92505e2ff9226f4c9bf235f38b82e07 SHA-1: 8a3dab9ccfb3f488870b00bd9ecf67000d039bd8 SHA-256: c62b7bee96130a9de6720882adfe44c173bbe6799186b4a1ebfea334cdcaac1f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farm characteristics suggests the document's primary purpose is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://nomylo.ru/uplcv?utm_term=how+to+delete+learned+words+on+galaxy+s7 PDF link annotation
    • http://alliance-ltd.com/userfiles/degesigog.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc9e4d6293b---lesuxaletabukesomo.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/xidovon.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/lerujesivin.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acec3fe81ee---5337185034.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609592e9f12c8---wepewikomufiwinivudowifo.pdfIn PDF document text
    • http://zuche0551.com/upload/file/93968393302.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/78151797595.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/zusefavupazonoxefajav.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/wepopipatorojezulewev.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/50098775769.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/6a8bb17032427849a6b8da6bf4a8cab4/zupofat.pdfIn PDF document text
    • http://chpcentre.com/files/file/xapavovi.pdfIn PDF document text
    • https://airbays.com/userfiles/file/kijirawapigujugubenigos.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/wememudavokebinunoni.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e08cc72eaec01a89e8fbeff6f0de57a0/71725084832.pdfIn PDF document text
    • http://sdds.be/userfiles/file/judovegefuwivepabana.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/58839828749.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/savepafuzomoxubofowegiros.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbaca9ea23---21535078338.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3364b716aa---56806346376.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/72f854a03cd8b6fd2113edefa147be4b/43240552383.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/mubokotobolo.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe63900c37---xixusu.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/73130411876.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/49057945256.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 17520 bytes
SHA-256: 6635bfd16e9672b74afb5761cdd4cdaf1f040bd3a179769fd50029110c67d4ba
font_01_sfnt_off00012787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F98 16084 bytes
SHA-256: 169060ee3d4a28e10bf8902f35113a35e3026fe70e7561f94e8bfa04626d1e03
font_03_sfnt_off000154c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154C0 10672 bytes
SHA-256: 22ce3a70cec0b68eb3484fcd6f69b7890913e8a3bd468c9d4ab14e55dc1624f6

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