Malicious PDF — malware analysis report

Static analysis result for SHA-256 e14f4c72871b5548…

MALICIOUS

PDF

77.4 KB Created: 2021-09-18 11:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c340d6e5d5bad427cf124eff7780acb SHA-1: 8c923b619b70bcbe3389ffc392299a032333c718 SHA-256: e14f4c72871b5548d7a58e7b1ccbff1954924d62c3c0e3f712cf66b598c17f97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=recover+reset+android+phone PDF link annotation
    • http://aydinservis.com/ckfinder/userfiles/files/liperaxurobutezinakunuzo.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/wekekojoxenisedu.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/gevewetutufujemafami.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/5472679717.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2d0b00fce---65880801110.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/69517474373.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d98c51e2f1---tidigejoruselu.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c5e1872a54996d7e35f81e4d48b8fdee/gilalata.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/julale.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/197e8bac1e39122ca8ad3299ce11cc8b/wejapoxukenakuvazesesim.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/25789843195.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/gazalodusiwuwikuz.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/biworevogiwawupurak.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/4f73f5e65dfc0f6bd72d77f01390c9a9/lumawifurejitozoribo.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210904131252566394.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/rexasibuwe.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210909213205_1039814126.pdfIn PDF document text
    • https://filetorme.com/upload/files/mafiwekojadi.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/tipob.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614305dca8e94---84571323874.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/31189741358.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/pilizelidarenadujojowaz.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/15480102271.pdfIn PDF document text
    • https://austarpharma.com/upload/files/satug.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_off0000ca29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA29 10676 bytes
SHA-256: 53c3b20897733eebe542654e5f5f4c28ab1f41d456b4cd4dea2f8e568233cd2a
font_01_sfnt_off0000e2a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A0 17464 bytes
SHA-256: 801c8c590e05628317a233aa6cdeda1e248548458c6f74839b1a7729e909665e
font_02_sfnt_off00010fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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