Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aeefa1fcf36eebd…

MALICIOUS

PDF

91.9 KB Created: 2021-09-06 16:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 123d51a7c1b478f9598b4975998f02e4 SHA-1: 740d05f9fa1851bc2feb59d6217e5fb84e1dc0e8 SHA-256: 9aeefa1fcf36eebdb59400bbb7b7a8ec82e8546202042f5e9d93982eb8c22c23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://caribemed.com/userfiles/file/97487748618.pdf In PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/51428f019a84d7f4ff7869cee96e784c/fenatabutiwotomeruteki.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c17d4879a8---sipozikisegaxebakusew.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da5c8586744---30583510368.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/lavaxalolulatigudulutero.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608835ee12605---miwukodajo.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f427d793cf---80904279150.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/37029074726.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/25944828536.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/3b96e67613c6d677c68abbfcae8ebb69/xewowofiwejokerubisuvazej.pdfIn PDF document text
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/popifelugoxotusisepax.pdfIn PDF document text
    • https://clubon.top/uploads/files/62398700833.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/30076553485.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/sudepegebafamukofimame.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/p2fimhb0477tm32s94l4vvpq8k/6437980868.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/60338248240.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/39523523389.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/5949180409.pdfIn PDF document text
    • http://chipgene.com/image/files/20210719_075351.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/xufag.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/rutenopadenolukune.pdfIn PDF document text
    • http://jar-ted.pl/file/pezuwedonubazagebu.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/vowewopevarub.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/75968190589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=importance+of+tourism+and+hospitality+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_off00010200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 17644 bytes
SHA-256: ba88d43823820c6b5d7031f74c8a62e74748b227e6627ca16aa375d1995e4637
font_01_sfnt_off00012fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000147f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F9 11052 bytes
SHA-256: 76e7a8a6c55b0fd9b2d981e15edc930103935dcf8b0b6b07e3a65b43b1a6a4b9

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