Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a5ca6f3e52ca78…

MALICIOUS

PDF

73.9 KB Created: 2021-09-02 04:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f05d3719f4d5a169c202a274aa8bb9dd SHA-1: 8e9c7f4c81c4a248b24b404c1e130f28e9fa1603 SHA-256: 52a5ca6f3e52ca7830b6482d55686f526a54dd89dfcbd116e2c5df3a8f8e172b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to PDF files hosted on compromised WordPress sites. The presence of multiple PDF link farm heuristics suggests a coordinated effort to distribute malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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 https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/j55q0gpdbtac2kbcjl0i1ca4ep/kenanane.pdf In PDF document text
    • http://slovbau.sk/test/userfiles/file/xutisemote.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/t4j4sl2gdloaoin4scfgbk6mr8/15638887886.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/872d49b7e426f87812f92374a989ec82/fofij.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/90785984447.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6154ca278---dapede.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/pelipa.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c45bc57575---muvovu.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/mufesavoti.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f912f98a65---15329934280.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c9c334ab345465729b11a24bf3cb2d95/11498718392.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///daremitozuset.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/sowumiwuxavugo.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c241dce8b02---piruxax.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/40b846f58d2c0d7d6e6c867a2617088a/34783616384.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/66942357125.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/xajaweboronaretomi.pdfIn PDF document text
    • http://fpole.ru/sadm_files/40774164049.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdf5ecaac8---rogozigulomitununavuso.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/5911801693.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2e92cf33a---16146889722.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/86524974966.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb872c18de---68621287750.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/7v7fsl9ek4ibcgq5rkahqvjqu9/putojigi.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/32849794717.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/9bb691bc46f1fa94d05c45bf71f4f428/towapopadazilavudefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=opposite+words+and+similar+wordsPDF 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_off0000c071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC071 16100 bytes
SHA-256: ff2a7292c1d89eacf41397a62347df23a4a5824af2451a3feb158a5eb9cf9a44
font_01_sfnt_off0000e96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96C 10664 bytes
SHA-256: f877bd49d7e9b6f4e9441296adc1f539d0dad84777e732e53fd029bd54c9340b
font_02_sfnt_off000101e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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