Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea85cae6377cc2e…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 10:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0efec82dbd4841f4e6be3ce667f332e7 SHA-1: 6ff9643e07fff8227a2186373ec6c1958f46083f SHA-256: 8ea85cae6377cc2e985c778b2fa81f2ca92f5f8279b0e7002a0e9512d6ccc166
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The presence of numerous links pointing to compromised CMS uploads and disposable hosting, combined with a visual download button lure, suggests an attempt to trick users into downloading further malicious content. While no scripts were explicitly extracted, the nature of the links and the overall detection profile strongly suggest exploitation for client execution, likely involving JavaScript if interactive elements were present.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://t2sc.me/userfiles/50716332130.pdf In PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb6ac280ebd---japoleloziriwi.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/c055bfahblte29sfd3hr681fre/bimejok.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/kamubejawiradoziwez.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37cb5a01b0---xekegijirodetox.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/jle9vkuvm3muvsh32pkgkqa4av/22805555355.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/979511540.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/29c5f5074dc663683ca93d12784b1d8c/24976440855.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/7599011059.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/5ljl08a7s84brpf1ebs4kuta72/81584107922.pdfIn PDF document text
    • https://theurbanthinktank.com/files/51196537400.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/4d959a06e544aa759af8e14cf4f3a992/rujapo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d47107b961---30090763536.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/vobazopivotef.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/lavirefodesubedeliwemoxap.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/xudigefezuluf.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f2abbe874---nujotumemowivewoximox.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/98052f18e1f957ad5999262bc7f3b546/gixum.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/56246277130.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/jusub.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fd750c572---8066026840.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/161067f47564b2---77185289284.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/subagotavafitit.pdfIn PDF document text
    • http://hoacanh.net/luutru/files/gikedisowenev.pdfIn PDF document text
    • http://langmypham.com/luutru/files/kofubadituzujovip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=speakout+advanced+pdf+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_off0000dd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD23 10772 bytes
SHA-256: 5e2ec2c6c08e0c6dab1eb2e937756b84973fe5b93e9e904a801e331661a556aa
font_01_sfnt_off0000f633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF633 19288 bytes
SHA-256: 2d71e7705fbdaf6ab8d9609739537d4b64ee770be5118f48d6e1232e14336b65
font_02_sfnt_off00012927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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