Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e033f76553c219…

MALICIOUS

PDF

81.3 KB Created: 2021-09-21 14:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f2357be5e186552b42373113cb403b3 SHA-1: da6dbaa80e9ff883b9f1d1b9555fb73c3594fbb0 SHA-256: f4e033f76553c2196b59edd2ca8c480f1513b83392fbf0fd9a07152bfd96c90b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm is a common tactic for initial access via spearphishing attachments, aiming to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://emtracing.net/userfiles/file/jotadeseruwabererolos.pdf In PDF document text
    • http://physocare.com/Images_upload/files/zutewuvobupofo.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/74573867340.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/zilebuwewugovika.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/33495192058.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/e12e2683c01d3db7d2c1e38b888bd90d/99697689845.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/95770108746.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/033adeea1b826c37fc4c62efc58c1212/lifisanalujoxemune.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/wasonurorepumozume.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/nilisazotunebopaloxawivev.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c66fa8a112---rafowaxegabixidulo.pdfIn PDF document text
    • http://webs123.com/userfiles/file/59065232563.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/logobetilazugaxar.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/xizatenugu.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/bisenuvamonane.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/25941416945.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/donelixokotub.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/getuvuzonixefinunibup.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/jugegazatupoxesalegibawi.pdfIn PDF document text
    • http://agilesolutions.in/uploads/lasonexamo.pdfIn PDF document text
    • https://tipresentoio.it/images/file/87365247540.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/38197874899.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/jinexirabew.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/55305445664.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/zeriwawojoredefuwajawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=akinari+social+linkPDF 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_off0000da02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA02 18056 bytes
SHA-256: 687c0b5109d7fb57d746ea22ada24f047489718b24740ab488b55f169559918f
font_01_sfnt_off00010967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10967 10068 bytes
SHA-256: 6f853d98496f91e371f24129a00fe6b01cdf7ae29c175fc2a42d7fe95127cf40
font_02_sfnt_off00011fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1