Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c8f732a0bfb9515…

MALICIOUS

PDF

84.2 KB Created: 2021-06-25 15:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6dc11c4b35f3ad03ee009103b921485f SHA-1: 3760211149e49df7692f9526e4eddeee1669a2fe SHA-256: 8c8f732a0bfb9515bb01b897da201ef67572602eeb7be2154b38397cdf052750
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains embedded JavaScript and numerous external URIs pointing to compromised WordPress sites and other disposable hosting, suggesting it's part of a link farm or phishing campaign. The ML classifier also strongly indicated maliciousness. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://inwebjor.ru/uplcv?utm_term=large+pupils+in+kids PDF link annotation
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/37562b5bdc25403a8c9611b9ee584b8d/vebava.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b232b4e4c5a---26814177438.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/robenuboriwezulakunowonib.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/82714893274.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608018ac0c01a---75099229081.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210609202226.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/fogaxidisazunupa.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/sajesewuxapifip.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79959c57c---85491756310.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609013be9d295---funinetafif.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/b3ee444e38d5607f24f86b2e13ff3698/32381528936.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/612c03f0a9a695ee1efa9bd4d9b2becd/51828696289.pdfIn PDF document text
    • https://designclarf.it/file/zibosewuti.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/rikoviper.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/31urrdhg0b7bfvtr0077epcnul/bagamikavuso.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/84cbe2f5e3cca8b4341f1f0b70e2557a/12247586829.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/9f78192eebc0088674b094f2da644e5d/xazise.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae63cf2418b---33065085712.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_off0000e584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE584 10496 bytes
SHA-256: 076bedc2e934af87ebfb4044a298d099f91427b98710f699ec065d15d1d20219
font_01_sfnt_off0000fd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11544 17404 bytes
SHA-256: 96c31aace8005c447e35592d38bbb18f3ce6edf3491cadc9cea3f69c5b7b5015

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