Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9970b95410b428b…

MALICIOUS

PDF

82.9 KB Created: 2021-08-23 16:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 625b33cef795c5001f22decc85c5489a SHA-1: 6ef6164a5a43392328e04915523bc5e47576ceea SHA-256: e9970b95410b428bb83a9cfc3007bf6059c471d557fcb95df4421e959bd0db82
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised websites and disposable domains, many of which host further PDF files. This suggests a link farm designed to obfuscate the ultimate destination and evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/66038186345.pdf In PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6ed3c0ab0---81538625834.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/42723984004.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a83ab833e---dobisurumo.pdfIn PDF document text
    • https://okinawa4d.com/contents//files/gagufafenovurakovagepasuz.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///vinisufizeridize.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b2caccb9f---78846455849.pdfPDF link annotation
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/8a1798bb6470590db33cb2425d530595/samegojidifodezefimotega.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607915f602e3f---21215454243.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/13648164540.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/70482350972.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0f5b250e6078bd693923e6dbf9dad0a6/lonozumetatus.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210809003141343.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077dd7dd2c86---mafukokimosele.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/zopebiso.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/6621274801.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/31312973907.pdfIn PDF document text
    • http://gibisch.info/files/files/76219470338.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/75f881e4be6c878438e3baf072ce4ec3/giniruto.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/kamivujesokokofuko.pdfIn PDF document text
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/digujuxulebebopafub.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5870ba326---numipeweguvujubonaxuka.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/nowumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=shadow+of+the+tomb+raider+day+of+the+dead+outfitPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/dedoguneneturugoxo.pdfIn PDF document text
    • 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_off0000e0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BF 10816 bytes
SHA-256: 27e741995289358196adcba1cfd7df69f972d62a9916a370373a58904a0ea1f0
font_01_sfnt_off0000f9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C9 16520 bytes
SHA-256: 5c56df05ced9c2d1bad504a1f7f5d185d6678a19fb2239fd2a09b10108566d92
font_02_sfnt_off000124ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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