Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e7c53bf7d63d21…

MALICIOUS

PDF

87.4 KB Created: 2021-07-01 11:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87c0d809c9bc284070d472444877567d SHA-1: 0f3c5d491cdbd24b255a7fe05118f27103685083 SHA-256: 85e7c53bf7d63d218576af28f02cc22ac76f80c932bd652416a1c953668eb6ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised websites. The presence of these links suggests an attempt to lure users to malicious content, likely for phishing or further malware delivery. No scripts were extracted, but the structure indicates a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f1cb1813af300cf763bd572afdd4a264/sofarenatofujed.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/d5f4a89049373a8da3f5d9fa4d8dc395/sodabuke.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac64ac31eb7---jekirosatonurerimudagomo.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/c48fac694bbb80f395df2b56227d3aef/bizepujivamakixevegopafaf.pdf
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/d9d1f6b85260d614d4a099a7d3e03d79/jekisulogokuzivesude.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa6f5778ea---49801427816.pdf
    • https://amblamy.ee/upload/file/wizonoriridoluvu.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c791056b8ad---bozagupuvokiwi.pdf
    • http://abwlanham.com/uploads/files/72983801314.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fc3682412---xidekuzupokimuvazorajujaf.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9481b9fec9---78323854334.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/m182u6lv1kju1pg2vasu51tli1/78915334522.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/fe5d29b4f9be8eb2bacf614b8660d838/pesot.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2b52b1c3f---temezejimubijijikexivuki.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/c4a18c9890c74154624f146dc2bc79f0/wizuzud.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/c9a4e4e048023204a82898651e47548c/julabisotituwowajokug.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afcfc52f7b8---50168884789.pdf
    • http://stroisvias.ru/userfiles/file/82975543371.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/31945956558.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/pgbf6pon8gbbbcvcu027r3qn0c/tibovalur.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/6b967fd50cfa7403b4dad2bee7e01d35/pukana.pdf
    • http://tpdw.pl/userfiles/file/76385381860.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec286b0df5---femoze.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=acromegaly+coarse+facial+features
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3fb.bin
c24c5b5cb5e752c930a3ce8ad5e6c72bc8c1cd6b2d3f1efa9d887dcb9b9d9d4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FB 10768 bytes
font_01_sfnt_off00010cdf.bin
514d8500435a4a1e05188194a1ba388949a3e22ccc6e1c05fdf12d8c1aff137c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDF 16660 bytes
font_02_sfnt_off0001385c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1385C 16792 bytes

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