Malicious PDF — malware analysis report

Static analysis result for SHA-256 e351feadc11a0e9c…

MALICIOUS

PDF

71.5 KB Created: 2021-09-19 06:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 81bb433bfd74667e9d4454b0820f1aa0 SHA-1: be447496aabc1bff8974d33c96ecf8a1f8a639e4 SHA-256: e351feadc11a0e9c127b34dc5063ad70e2fa1aa848e3a2031377c20c8d657921
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=gta+sa+android+data+folder PDF link annotation
    • http://wolfroccatiassociati.it/userfiles/files/6208109749.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/poxeronipigij.pdfIn PDF document text
    • http://taxfreepoint.com/file/nuwulik.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/rixukomosazinisuzuvaga.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133b376274ef---23929149920.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/23412562499.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/14070579033.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/jisapozuvivon.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/lanibapixaruveduju.pdfIn PDF document text
    • http://builderall.info/userfiles/file/wubunomukob.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/ragububoxunupaxuzo.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161444ab5c43b7---mesezeratilor.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/repusupebatafigepewu.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/xuzozijivutapuzugasiru.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de8da3637e---10217034475.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f59fe3a91b---89270133525.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/fifomumejupujizute.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/29491259734.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/zopoxurulevabikolad.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/tivupezubiziruri.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/midulogovowik.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/42864711059.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614336237a850---94162382318.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/21983367181.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_off0000b796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB796 15948 bytes
SHA-256: d7fc861de92dbc8facc3f737898b994e46c19a022c99cf4f89c8b0da17446d03
font_01_sfnt_off0000e067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE067 10388 bytes
SHA-256: e215ed9870407be49cf907bc3d55b31a84d2bcf458e7cc3c3176e5befef65e83
font_02_sfnt_off0000f80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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