Malicious PDF — malware analysis report

Static analysis result for SHA-256 511e9e728d9dcd54…

MALICIOUS

PDF

74.6 KB Created: 2021-07-31 13:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fda5eb26505cd8722cda4bf59a998383 SHA-1: d08e504c05be3b1e71cdb1d4f9201edeb1a0ea10 SHA-256: 511e9e728d9dcd542ec76e9fa795ce661a1275033aa57bc3a3b3ef1d8f276e61
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URI heuristics and link farm patterns further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acff270fc72---rarivisidi.pdf In PDF document text
    • http://rolmech-strzelno.pl/Upload/file/samejo.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/bativatuzodudoxofafafatu.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/69311109361.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608062fd33554---xotufugiter.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/xasoro.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9b1f82c3e---10242503837.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/71707355194.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/75327376921.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2e9861ad6---mirunuxewuza.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/bcdeca6c1b680208d2c3a538ca2f2988/65414964577.pdfIn PDF document text
    • http://netflor.pl/upload/File/saladota.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/kenuwove.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/temiwemodidida.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607386a45445e---zuralovukadarebap.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/62023273042.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/keximemu.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df8335df65---tijepojenigigakexozejax.pdfIn PDF document text
    • https://virker-ikke.dk/files/223837608.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/minoberudojo.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15ebbe77b9---porixuresolitibinujupa.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce081504acd---befovebokatamu.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/edif6nr8iq4jkoqoa39fvqjp8c/bimokogobitirizenuxep.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/13574403451.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/508d5cbbb11aca4744e0430b6dc9c6ab/gawakatoxaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sql+installation+guide+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_off0000c368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC368 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7A 15808 bytes
SHA-256: 91dcc5c23bb67e2aba1b26e61af5abc1d87647a161498483c81b1561fdb6e8f9
font_02_sfnt_off00010318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10318 10892 bytes
SHA-256: 4d3b3de57da9552d20de602d5e649ac53f4cc420405e754d8be16df6b1340260

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