Malicious PDF — malware analysis report

Static analysis result for SHA-256 246d0bc424dcf480…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 12:43:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0414b8b1839c423c80cc1d8ec1d250f5 SHA-1: 76c075da81f9c8fc504da62f30e2bb282d4f1333 SHA-256: 246d0bc424dcf480e450d857df42c218dd03a0b8148196d2012ea9407eaa0d8b
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=android+merge+two+photos PDF link annotation
    • http://batiment-tunisie.com/userfiles/file/zusesakewijubanujixu.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141d4568333d---libakebalorosijovumu.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f033af7bd14f983109b3d0d1a609bfad/9758282939.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210912025022.pdfIn PDF document text
    • https://vzglavniki.net/data/file/20124754022.pdfIn PDF document text
    • https://granitnet.hu/editor_up/41804284237.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/gigokavoxegubefex.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/80142951369.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/18528567384.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/rubulediberivolut.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/22152038890.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/89419251866.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/tipemegamosenatagal.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/nafovisemugosojedajeteve.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/18191624668.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/dotobaxubomarapobazimu.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/loputodareriwupagetakub.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/pezuru.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/zonimidowigesopoka.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/vudazigaminimepijaso.pdfIn PDF document text
    • http://levotst.com/uploads/files/92627378989.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/nizozu.pdfIn PDF document text
    • http://104408017.linker.tw/files/gasupa.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334bcb7ce81---75645088720.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/90878613536.pdfIn PDF document text
    • http://gewald.ru/content/Files/rononokizemomuduvi.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/28291401786.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_off0000e0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DD 16720 bytes
SHA-256: 79b5135bd52b41899726ee8c7128cd3e750c54854bcbaa10467389f0bbc3f2f4
font_01_sfnt_off00010bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DC 10700 bytes
SHA-256: 503d7fe9044de7663471b3dfed1b267692444189de38ba5f91e336b3cefa16a5

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