Malicious PDF — malware analysis report

Static analysis result for SHA-256 989d3aa2e23d7faa…

MALICIOUS

PDF

74.7 KB Created: 2021-08-27 18:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0d95532f5031c29d9c16f2023d8cbd33 SHA-1: 4fe6dcef21a25d2ccb9442181b5ceb020742c85c SHA-256: 989d3aa2e23d7faa9af16275eb8238262215dcd1aa9bc4664809756568fa0d01
96 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier strongly suggests malicious intent, likely to direct users to malicious websites for phishing or malware downloads. No scripts were extracted, but the extensive use of external links points towards a social engineering or exploitation vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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://archism.ru/uplcv?utm_term=free+fire+mod+apk+unlimited+diamonds+download+android PDF link annotation
    • https://svltv.in/userfiles/files/23091002338.pdfIn PDF document text
    • https://zhansq.cn/upload/file/31781596915.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/xemubakuno.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/53327060980.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098a95226c2c---zegefunude.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/0efd2500d9933e0fe5bac1e4ca0d3b11/4530494087.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160761fc61be89---memej.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f3cf6b33f---lebudejevilenof.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc83dc0880---49907488617.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be4f6453417---13567817161.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c47536ca4---wulaxezolone.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/64354972153.pdfIn PDF document text
    • http://deckdreams.com/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/55648318458.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160893aa208914---16828714627.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/60853793455.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/52024e44417eed2e63cfd220b090c37f/fazidagipisexixa.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fc4d99af8---mutapiwawuxadikabop.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/nosutugolonukebabu.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/72708897700.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/77095693999.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/dumugodutagik.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/mawuvafisusutasa.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/dbb9998mfmadkhmc3320kg5l9g/kodopuduja.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_off0000c060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC060 16416 bytes
SHA-256: 45fc9f79dbf2547cc5b8d8dc0e7a477a1a4b462fcfa62ee35cb85adafc70b463
font_01_sfnt_off0000ea6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 10912 bytes
SHA-256: 062b644e51d9de12a10f019f38bb7edfee6a54e27f838a864bc75fa1069c0a99
font_02_sfnt_off000103b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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