Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5bb60bfbd2c776…

MALICIOUS

PDF

74.4 KB Created: 2021-09-07 04:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1a62b74c59b23f51fdd4148466e7dedf SHA-1: 07ae5aed196552f0e85ede676303eb9b486cb484 SHA-256: 8b5bb60bfbd2c776ce1f1ecf42819814251394e7cc015f03982199ff8c468d45
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. This suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and embedded URLs are indicative of a multi-stage attack, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f909605ec9---33313087876.pdf In PDF document text
    • http://thayloilocnuoctaihanoi.net/upload/files/gididalob.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/rosijoxodizo.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7abea94e3---losikebababarob.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8b4a4f3a88a7bc1f19437c4a89cfc4d8/11425846812.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/14757766321.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/87737814013.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128a3cd41bb8---49698016552.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/35567349981.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/28846751452.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/msuao2t969s7c9of15ff9tkld1/nigixuvozugikir.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210531_A0AC5EF5E5F4A17A.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16260995471839942587.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/d20ad01513f47b04479036643125c321/xufezivitutawijutagat.pdfIn PDF document text
    • http://funperm.ru/content/file/siwibarenidivuxar.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/83471234936.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8841c3ea3c---tirazolitiguduni.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/venimine.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d052b0c623---wozanexusi.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/62667463757.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/9ac651e1fe7874f43b592750f8d41395/24950391546.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/t82usrrd92f9jgr3usvtcn3h7a/bonok.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/6635287498.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c79abfc7f2a---mezikadot.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210618201428.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=animal+adaptation+worksheets+for+grade+4PDF 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_off0000bed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED8 16840 bytes
SHA-256: 02c19e4f4d50cd3e9a61fad65789230f8664a84bbd08e0f0bf62b9d260e688d0
font_01_sfnt_off0000ea18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA18 11180 bytes
SHA-256: 18460a95df1afccbd891e75c81fc9701a2d0246496c46612744fca9d4876129a
font_02_sfnt_off000103ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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