Malicious PDF — malware analysis report

Static analysis result for SHA-256 29599663f621d504…

MALICIOUS

PDF

80.9 KB Created: 2021-07-28 04:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a215d5e08910d88d93ac0e4f1d6532aa SHA-1: 8da15a9b11b31c10809d4e6a15ca3b3f2b839444 SHA-256: 29599663f621d504846daf04f9b657a3d081b5956d2c7085a62a5d27055d9f51
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, containing numerous URLs pointing to PDF files hosted on compromised websites, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f712358bca---23424922572.pdf In PDF document text
    • https://powermailer.in/userfiles/file/78224585415.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b30e067bc1f6b92e08455d886966b408/1703182881.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/7059195151.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c48c6784237---86017913399.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/36173344287.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/vowim.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/ojr2t6hl0evq9sl6dms7g3he3s/1941145863.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/54911249336.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/12868986991.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2f6aab773---fovozitimisaba.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/87672292933.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/jerabokisiwireloje.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/747b8fdcf6eb493ae9e47beb1eeb2bf7/vizugedag.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/nesomuworemajifor.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/fikusutegu.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-4/20210504073734236208.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c33a8b0231720913dd4ddc6d049e795d/93159529801.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/webok.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e07c8b6ac---wonevitugi.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/18211087761.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96a55389d5---31012855398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=strength+training+anatomy+workout+2+pdf+free+downloadPDF 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_off0000d88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88F 16540 bytes
SHA-256: 3547ae928dcb800ce0ffca201fdfbe5b90fd1be01dfb899e4bfee5b6e15194e9
font_01_sfnt_off00010317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2E 11364 bytes
SHA-256: 2bca32d1bc305a3fb8186a8fa38571e56f1c37e923ab44c549553d7a49f1dda1

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