Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3b77f41b84a440…

MALICIOUS

PDF

79.2 KB Created: 2021-09-08 16:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7a3be522bc5bde9518653f03355f45c9 SHA-1: 649de6ce00d6992340591ae224768d8de6627d38 SHA-256: 7f3b77f41b84a44080e2ddb2a5b477f22405b276405f93557b37bec390fd5763
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to various domains, many of which are hosted on disposable or compromised infrastructure, 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, and the document body was unreadable, so the rationale is based on the heuristic findings and URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://locktactyuma.com/userfiles/file/bobiwakemudiliz.pdf In PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/41553474045.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/68221424018.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/lanenisobiko.pdfIn PDF document text
    • https://equalland.com/uploads/File/8997600195.pdfIn PDF document text
    • http://falerisztika.hu/tmp/88794645435.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/65740773969.pdfIn PDF document text
    • http://sushi-belovo.ru/files/1859368371.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/xemowisizelugavenonumora.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/muxojiposeweravom.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16137d859c0c64---36576941901.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/15279081905.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/mikadaniwefobut.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/maxovumivavasesow.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16137fb7d8386f---gopode.pdfIn PDF document text
    • https://badrivishal.com/media/polagexubiduxiwapuv.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613164784654f---vujukutuxixagukukiwumin.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210903081707_vfl3m6.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613610bdcf8fe---78841903128.pdfIn PDF document text
    • https://raljob.com/userfiles/file/97119412671.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/zakup.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/nitezopifurosupuwosijoveb.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/39188909288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=dell+chromebook+5190+manualPDF 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_off0000d1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B7 17308 bytes
SHA-256: e97a11f68aa86a0304d05ca04da527bcdffbf72ae270d592a2931c0590a08764
font_01_sfnt_off0000ff11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF11 10944 bytes
SHA-256: aafb4ea8dc8a8da0fd57856f6bc97e148f71c4f4f5c03840768d103059064606
font_02_sfnt_off00011850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11850 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1