Malicious PDF — malware analysis report

Static analysis result for SHA-256 27b00d96b3f7d3ad…

MALICIOUS

PDF

83.2 KB Created: 2021-08-16 20:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 28346eeed2e6fd27f9490f6fe27817eb SHA-1: 41352aeefc4453186492b0feb96d548a30e90636 SHA-256: 27b00d96b3f7d3ad4c032c41bda372a65b81a852c6f823b9a4867b009661d361
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The file's structure and the nature of the URLs suggest it is part of a phishing campaign or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://candbco.com/ckfinder/userfiles/files/40130190388.pdf In PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/40ba23d057b2098aa2f9219a4e96c0a2/zufexabofotemalesawet.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/mu20giqan15ql5jqufc8bv9686/35653154490.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/wuxezuwonoka.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6c1ca6c82831b5cf2c547fc9683acc78/torutajatadovew.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877f327b835---junakufo.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92481402998.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/6tjtefagfs7dpdfkn2q6n72hlo/woxelezijifen.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/2536794860.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/pagonabomoletusivefitulis.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/4ffa4a534eb3d391d72db3c858572d31/tanenowogej.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/suwidotutoniwape.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/4ca500c03040950e2b2236d6cb63f48b/kunimukeluva.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/dobejonilefudodo.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/fujigewem.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/15538145665.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/38u09jpgk24do5de16pq3n7j51/madesopofukowi.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/muniditub.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/32090834639.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/8279aaffa7ff2f4c7171aa0b6418c7f7/88897306808.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/wesomoxuxolujolidifu.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/rogajopuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=the+complete+illustrated+book+of+yoga+by+swami+vishnu+devananda+free+downloadPDF 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_off0000e345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB57 16312 bytes
SHA-256: 6062bea92b967a95e7b406d9682996ce8bfff89229b424cfe76b3200d8db4753
font_02_sfnt_off000122f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F8 11628 bytes
SHA-256: 118172643fdbc4653911356d04ea8e4398f42c32372d78ab2b4c142cc177d6f8

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