Malicious PDF — malware analysis report

Static analysis result for SHA-256 10ae7dada0989b5d…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 05:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9e53e45da762a33232f376745ab0a95c SHA-1: e89b685f1302e798bb95272e97443d63b7dbcceb SHA-256: 10ae7dada0989b5d85edf3aa20306a97cd4a5c0d59ea977cd5f6bc708a311061
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised WordPress upload directories, forming a link farm. These links likely lead to phishing pages or further malware, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad70bfae8a6---razumaf.pdf In PDF document text
    • http://anvlaw.com/userfiles/file/tekijonaletuzovav.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/80807602637.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/wajedebemibuvuge.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/muwadosogufemezawigofepo.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/xegijos.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/35138015099.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f901dc559---budaxopiripebibomizu.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/bb90899b8053ee97fbc1a6e1421d9c1f/fimubexigexi.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/86112828416.pdfIn PDF document text
    • https://pasarangroup1.com/contents//files/80768178628.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/ad098f0d922a8a4f7d4efc2778d0b13b/jonewolaxunizeki.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/74d015dd8cac4ea5cc46b13e5679098a/80464100425.pdfIn PDF document text
    • https://equinox-e.com/upload/files/kowukeliremafonelunubu.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/9ndqfo1sn217tif8sc9f7ilpvp/tizenokogi.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/nikebozinewapinulavoziwub.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be65f11199e---3483806271.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaded2c7eb8---12399076592.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fabfefcf37f---zorezofinufagavoravub.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/50c8792aca73ba434992a07645220652/11130301891.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///bovuwisumixikufezopoda.pdfIn PDF document text
    • https://europartner2.pl/uploads/kukodabutim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+drive+a+manual+car+tutorialPDF 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_off0000d3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EE 16564 bytes
SHA-256: e944be04c7644c930698ecb95216c318c37686f8594e10e2f6d0c2c7e60e65a1
font_01_sfnt_off0000ff27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001173e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173E 10604 bytes
SHA-256: 76407e752b37e2d696a349d367e5fa64ca4b073a3229b1fecb26c806154ec9a3

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