Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5d8a3c167efe67…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 16:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3903f5bdb52850c848e6845c1b5051b9 SHA-1: 6d9d6d01e6732b2e131d42933eb46c1a2c80c652 SHA-256: ed5d8a3c167efe6770ae3581c7779a8fc237669773ffbc9b09563f61f1cbb0bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161167b84ce663---jowagavosozibir.pdf In PDF document text
    • http://www.jindatunnel.com/up_files/file/ratavoduwa.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/b697fd3e1d08c264118df0427e9792b0/1670222440.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081d871cb4a4---zaguxiwanagusagusule.pdfIn PDF document text
    • http://mamam.by/upload/File/file/zojinexuzijibubaradewopet.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/pagozitasatube.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300b78cfd6c---vodeditix.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/68f66fb8b0af5a81a5938e74f0de3868/lexunibibofujuwozazevad.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/jilub.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/baea284b4e051b50dcc22af766766e9a/26645903142.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fd6fd33d2---nopapefixipunefojifujeko.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/68865426381.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/bibowaxonuganetejugapebu.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/11795739391.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/jorise.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/65946605900.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/7758251085.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/dojiremujemari.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/aad8648a05fbebecd6549c5f9a2a364c/lonegomudetimuganaseriwow.pdfIn PDF document text
    • http://iucecb.com/files/file/jeloworipewe.pdfIn PDF document text
    • https://cissud.it/uploads/ck_editor/files/lajaratotibukekix.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/jinukaf.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/86bff141b3491879b96fd21896631509/mopakuzil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=grammaire+style+direct+et+indirect+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_off0000d91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91D 19900 bytes
SHA-256: 8d7618e7baed513867a55dbce8386d77023a240bcfaab618971227a046b352ae
font_01_sfnt_off00010d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0E 10812 bytes
SHA-256: 7013cb679bd10ad22472a89e7e91bc3c87d53d0f8e71cbd7a8208a4e77267841
font_02_sfnt_off00012605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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