Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e9b4c3ecd2f66b5…

MALICIOUS

PDF

77.2 KB Created: 2021-09-03 19:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cbc05cbaa5a1f86c7907a873e84d596f SHA-1: 85a835d5f954272c3553a1ee690533d6c2cd68ba SHA-256: 6e9b4c3ecd2f66b5eefc2f7c82b4b4a4734f7892d0cb0cec6cb844e3c8029deb
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many hosted on compromised CMS uploads, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is a phishing or malware delivery vehicle. The embedded JavaScript likely facilitates the redirection or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://allytemp.ru/uplcv?utm_term=implantes+cocleares+en+ni%C3%B1os+hilda+furmanski+pdf+gratis PDF link annotation
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/77530216638.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210731_F579928B5A11C92F.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/52568254215.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/160763839057d3---89984201983.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/76686515852.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/rgdlimdec6j2tlm00rgpcult2m/62285979486.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/wames.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/zagukowugikano.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/24795761364.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/mawumivefuvogi.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d86c3421cd---gawedewutabevaved.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16094b193b28c0---lotuzo.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/d721999555adac7a605a7bc83bbfd51b/63204018251.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b161ceeb295---54065741640.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/06f493d9fce835acc5c0ff0a828b46d2/fanapisinajasova.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a55fa367f82---78546390380.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610b754ae3eec---gepazudobaxokemotuxejit.pdfIn PDF document text
    • https://cpc-serbia.org/js//files/daxuxedidemugudawivixuma.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/zumoripu.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7e82dd20e47106c90e325306e79e811/433393287.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16081e6d982309---jarebujas.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/3655619397.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131abc28e7b6---97257739642.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_off0000c390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA7 11416 bytes
SHA-256: 71e42014a470aa2c70b28c5b770d0b4042e235d1f27592dd289de878fcc1c171
font_02_sfnt_off0000f5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 18140 bytes
SHA-256: 5921913e20b848e116d266423f449ad62b214439fe3b1b622c87195ebb44ceac

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