Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff843a0c122d4845…

MALICIOUS

PDF

90.8 KB Created: 2021-07-31 15:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 588ceb4216e0bdcc4110adc845cb4692 SHA-1: 9b0ccf09b83b4f0c401bf74493a76b2657c139f9 SHA-256: ff843a0c122d484576ffc7d2b66a57b73bbf13e6910a00bba8660aa279669965
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and a link farm indicates a pattern of directing users to external resources, likely for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://foundryindia.org/userfiles/file/85547557493.pdf In PDF document text
    • http://nct-vn.com/userfiles/file/finoxasudadobegarapote.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/38561408514.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/sobumajujosunosutef.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/temobizefiso.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/pupojiwavimokazibodimif.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/52428411123.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/69870467463.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d4a486475---32411557508.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4775b58eb6---77094969255.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/tb02roj5prq277kthh7d6f0t67/sinenobuk.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a35459043be---gelosegebikedu.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/namonavufikotapejub.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160acff9a5f3b0---terupaxo.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/fd762719c3a03dd110e7be8280548025/55175551400.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/tazirijuf.pdfIn PDF document text
    • http://palami.by/images/file/48620240895.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/vazowukukuwo.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/eudutad32avqtogjart2aij556/jupojakuxorebekude.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/wedekozevikasatos.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/vbhn4c3mbr9p1atnav63rt6t72/74050020359.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/6fdah252m7mbka0dgahj5njd6q/gatorodidataxoro.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ur6anf22ga4ct7nedtuld77vt1/95597018760.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/jaxekuvazukifemuto.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/wuwowigibedewigibapido.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/bugigavuroguzamalorenedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=passport+size+photo+uk+appPDF 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_off0000ff43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF43 17204 bytes
SHA-256: b44b7c5cd607f5d97aa3cc47fd58fa09c1aeb114b0acbff2b694385d23fabf53
font_01_sfnt_off00012c4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4D 10452 bytes
SHA-256: 2057112af4a6c785e1b48f1877900518a1be7b78d719bd6ec7829d7f0461b473
font_02_sfnt_off00014442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14442 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1