Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fabd486bd060718…

MALICIOUS

PDF

82.0 KB Created: 2021-09-08 02:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b34bf3dd5d32e6c9a88ad334b6055c3d SHA-1: 0ab27f646f57d213f3792932105d781a20f8ba99 SHA-256: 1fabd486bd0607185c7796374ee94b1fc53e5d9f4316c1ba059182e1a005725d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or redirection scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the URLs and the PDF format suggest potential for JavaScript execution or exploitation to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/d09855722f89dfbd92ee2b2d5899dab0/55405922436.pdf In PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/gatiselagiw.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/jujemo.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5305c2093---mimuzezemokek.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/zotor.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/jufipozafima.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/xasuwawujuxilapuriweboset.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/ou3eq53e8f6js0ctgkk4q9jsdl/magumupukijuzadep.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/tedidepugobigupurufaxoxot.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/duzimirumovuzofa.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/52804203749.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/puwugix.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16085878a068f5---2488374905.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/lijowipilajefe.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/pl14snolna3g9ku11stpmbo6v3/59079088552.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073e06f1843f---sezimixulazises.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/85363057065.pdfIn PDF document text
    • http://irollee.com/userfiles/file/31111599875.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4876166c6---suwajubudu.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/8c6273279ce0a9f3f1c3418bf8458bcb/mipojokinizafurojumelerif.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/bebep.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/gomedoja.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/xekate.pdfIn PDF document text
    • https://tmtteks.com/files/83321773115.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/nigisinejobujozavo.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111ec81b90ab---81415511816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=java+itextpdf+pagesizePDF 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_off0000db17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB17 17788 bytes
SHA-256: 228328e79e549dd12f95ccf9aa3304705b13e9549c6a675906e99e7a66ba018e
font_01_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 10520 bytes
SHA-256: 4e1630d9a85f8b12585e0e42c0d6c56cad1e09359c870609985e9fbd034eabd9
font_02_sfnt_off000120d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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