Malicious PDF — malware analysis report

Static analysis result for SHA-256 9866f930c2b412ac…

MALICIOUS

PDF

85.1 KB Created: 2021-09-16 08:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 05432c6fa1cdb51bafafbf80adf48846 SHA-1: 6102b725a7861b1b0562dabae63655e7b88c035c SHA-256: 9866f930c2b412acb635e87cbe111ffd316f001e7e1944a8236e880c1c9e64e0
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links to external PDF files hosted on various domains, suggesting a link farm designed to obscure the ultimate malicious destination. One heuristic specifically identified a link farm pointing to compromised WordPress upload storage, indicating a technique to host malicious content. The presence of a 'download button' heuristic further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/gotalapo.pdf In PDF document text
    • http://shinhwajudan.com/userData/board/file/ropadenexalimaresiwik.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/tipefike.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/8120e39a8e6d9568891aa511c9510946/64675022852.pdfIn PDF document text
    • http://erpos.sk/data/files/58084141183.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/9q6u5d0tbt38k7jl0prjtqf3po/lotajazezitofiviwiz.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/bomodoposejarujigabo.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/22102912755.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/lizaneveteg.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109130130083458.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/62736942257.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109010821154668.pdfIn PDF document text
    • https://hgb.se/filer/file/nafavepijowefowimu.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/vufumeja.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/7183766985.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/fased.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d318069342---35838958348.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/wavinosilewulozafilatote.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/tiwakutewogujufazo.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/gozaseletej.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109140238254170.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/mowix.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/fusosijorovugomip.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd66303dd3---24717677908.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/gosibosivuraz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=mi+pdf+viewer+not+workingPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/nosusenabetoxavusiteje.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_off0000e6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECC 18644 bytes
SHA-256: 595ca6439ad88290bdcbb2597f0374d16af6befa02c08b150d22e1fffe1e0672
font_02_sfnt_off00012ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC4 10536 bytes
SHA-256: 611fbbf66c03c7faa0c04276c56cf980c5d9821c40ce48ab26a97c24112b5754

Open this report in the interactive analyzer, or submit your own file for analysis.