Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4a75b43c882644…

MALICIOUS

PDF

78.4 KB Created: 2021-09-07 19:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df6b82c594f29691f7ae1e7f38d0f997 SHA-1: 492fe0553d67b09d27f01df598a88701fc7899bc SHA-256: ce4a75b43c882644b8ba5ee2d690e7fcc30f974762ae4e691780b01a5b6b872c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDFs hosted on compromised WordPress sites, suggesting a phishing lure to trick users into downloading further malicious content. The presence of embedded URLs and the overall structure indicate a phishing attempt, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088ea147ce63---zutopolabosav.pdf In PDF document text
    • https://angkortaxiservice.com/userfiles/file/83042380077.pdfIn PDF document text
    • http://lhs75aa.org/clients/0/08/08eb77d093c5251d787cf05842b4a73c/File/36819244104.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/90530286017.pdfIn PDF document text
    • https://noventa.cz/media/files/file/83661133877.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/db0a6d57191574e688c2991e5d87ea8e/10872964440.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd397268706---ritisekoforudaburosurosaz.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc779627084---1598888792.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/48187691652.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/a408af972170f0c40fce8d33b4dfe716/79663079980.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf4cd90675---9693537900.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4839a1b57---35955963764.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/54875833657.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/99046803540.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/q7b0ts5p2m1ktk5kj7ejoritsg/piragakeluzevutixorokadaj.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/fcb9de2081a548929734ca1d36c12c54/80515371231.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9988c07035---22942906441.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/90874576988.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/14207426822.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/74866700339.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/50799747945.pdfIn PDF document text
    • https://banghenails.com/upload/file/81394418976.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/xenavow.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/3529b953bd143c290b8e60b35d0676cd/52807082610.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/a8b9bd7bd2d03875f00a436b2fd03e39/97815900018.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d73155ebff---seduxukosinazotilima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=icici+payment+slip+pdfPDF 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_off0000ce9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B5 10628 bytes
SHA-256: ee099ccb07e14299c4ff33a2f0a5ec9d7bb620e809bb068409282c2e8e11666d
font_02_sfnt_off0000ff07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF07 17288 bytes
SHA-256: 8d2af08ccf278130e2516923ddead9845eb0df902b0fe0d97e0dca074e28b1f0