Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aee7f176220b7b8…

MALICIOUS

PDF

89.7 KB Created: 2021-07-02 14:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 872402d5139c2974ba086780198fe407 SHA-1: ba6e286e4cf740224bd6e236dbc384a7d2644267 SHA-256: 5aee7f176220b7b85d0cfca5d823c7b32683e45fea1081bd57c73d853d2d0132
212 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external sites, many of which appear to be compromised WordPress uploads or disposable hosting, suggesting a link farm designed to distribute malware. The presence of a 'password-protected archive' lure indicates an attempt to bypass security controls by hiding the malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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
  • 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://infrive.ru/uplcv?utm_term=icloud+activation+bypass+tool+version+1.4 PDF link annotation
    • https://motelandratecuci.ro/userfiles/file/wizaxefaxobakijidipivima.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/poluvipatav.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210621181957.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/gapotonemog.pdfIn PDF document text
    • http://rotang.net/userfiles/file/munagogoredukave.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/blokl9uicr9daq0u6jnb7f0apj/sodojasazigawaxakewuz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcf1d5ed8b---61613402658.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/modamijubovuma.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/93734554325.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/07b80e656731f1e626e183aa4b383e48/29786376102.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/gvee4bio7qqnve5vmkcd6efv42/48905542062.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160808bb6d68bd---gawiwikobiwuleb.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/86149036482.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6032438197.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/8ojr8j1avrhmud8b5bkost89bp/wupubawaseduraparo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160845e6e33885---xovorotofozowirijoxe.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db713005c66---82333525618.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/95190907590.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160917d44497c1---mojirametonobatavuwineb.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c3c08d1d5---joluvaguneziwoxabomola.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/c2ec9bc0e68976f026274cd80a1e9acc/zetotat.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2307a71e59142c3c608f8e2be29f9a7f/pojonoporenamuzetopotali.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9cdaebbe9---satajew.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/353730552a1053103a93fb71dc9c8528/5955556950.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/41732223604.pdfIn PDF document text
    • 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_off0000f74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74D 19024 bytes
SHA-256: c7f1c18d19f0558d136587b26345ee0f03fb21a0e86285cdbd5651e2992dde7f
font_01_sfnt_off00012786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12786 11076 bytes
SHA-256: 1c81ee3de38b739123e52eb6dc71c7b00e2271dddc833b935508693922f9b069
font_02_sfnt_off0001415b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1415B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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