Malicious PDF — malware analysis report

Static analysis result for SHA-256 5939c04eaa9cbcf0…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 06:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ae288d7d30ea863527207811ee35fb15 SHA-1: 707ea0f9a34124b133fd7d693054fb30c8771f6b SHA-256: 5939c04eaa9cbcf0e52f07d50b249c7b4a7785dfcf269bf8dfc8223691a7e2af
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Multiple URLs point to potentially compromised CMS upload directories or disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure itself does not contain readable content, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://livestocktool.com/d/files/xikevugekuwovumitedufa.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613be47e1eb1d---jepowidudokigi.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/40391379973.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/gimifawugovofeburefofifow.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/gimojijososibi.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/98840102953.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad1e7c9c3a---32194820847.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631279787.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/bukoviwalafevupedet.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lukekej.pdfIn PDF document text
    • http://datcat.vn/2018/file/fizonorarubo.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/jifitejimetibiwenagoso.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a875d32d93---xebarobe.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/1379339153.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/96899229839.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/34693123859.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/98900495786.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd36ca1468---potivi.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/vaxurogepugo.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc6ccdb0b2---gonegirerilomiwadavumage.pdfIn PDF document text
    • http://igruppe.no/ckfinder/userfiles/files/mubizuleludari.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/tubelejidimuxur.pdfIn PDF document text
    • http://glttek.com/userfiles/file/37791246817.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/49528431271.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/54878685796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=cast+my+phone+on+tvPDF 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_off0000dd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2E 10492 bytes
SHA-256: abd0cc08ce13172e140278af5a8ca8be2aef11cbece92d3fc5e3a16d5db29655
font_01_sfnt_off0000f4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D00 17800 bytes
SHA-256: 4234c89128a99e3ef2fd6f6e1cdc63daaf19e470822b0e7d6f9535651ae5ec61

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