Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa650ba7e3e0f82…

MALICIOUS

PDF

93.5 KB Created: 2021-06-30 10:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 946a8c25c38a11bf8d38d13a9a018d35 SHA-1: 751842f24de6db95c94fdfbcff365e114efed979 SHA-256: 4aa650ba7e3e0f824edffa4d2082084428f99fbade7f75a22cd6e9dae99dd2d7
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and disposable hosting, suggesting a phishing campaign. The heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document attempts to solicit sensitive recovery secrets or private keys from the user. While no scripts were explicitly extracted, the presence of PDF-specific heuristics and the nature of the links suggest a phishing lure designed to steal credentials or recovery information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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
  • 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://uleiuri.ro/userfiles/file/3278458388.pdf In PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7b440acc8---nozajifisusup.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160d872dab3ccc---37363921056.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/m1j7v6cbh91eg29vfsun8q68b7/kukorifotozojifebisupu.pdfIn PDF document text
    • http://absigorta.come/file/95314445217.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/kjmk0v0j7ffnmiss2aiop8ht53/kolusupitanidovewufe.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/609f39974acaa5094acfc0781d4085c8/pazepijarogosumixewi.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f71fbe63daa1a94b2a2046eaa885347/titafisebupope.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/parifi.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/87040178384.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdfafa3df5---makafinesepitolef.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/07a05e40a4d41cc4a5e93981a6e43bb4/famorivamolaregitisatuze.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964c4b92f32---tejifozifixedunijezibez.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cb677f4a96f---jupezodedizejeti.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075357b352dd---budilerufikemexato.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/78633577640.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/88503700739.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/45961489350.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba18533fc6---zetijugofejimuzosukivaj.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/u957u1jubocl97pk1s6chvqpv4/41457715826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=top+10+icoPDF 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_off00010e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12615 17608 bytes
SHA-256: 8fb3471ef7f4872df4cd93bac9d147a08015760c264880e20f9e3ad61f3ea7a6
font_02_sfnt_off0001544c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1544C 9692 bytes
SHA-256: 775dd8c736e4068273fd7f2a567d38b3d62288c3c373c7b78eccb88dabd0ee46

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