Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a1231ae6526bf6…

MALICIOUS

PDF

91.3 KB Created: 2021-07-15 20:27:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f77a3b1d99789271690c0839b88634ea SHA-1: 52e61e023ee4a806e5899b378bc91aa2898c325c SHA-256: 89a1231ae6526bf650eb867dafc016cb44253e2cd4d6367ee08b19b39f832e7c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting it functions as a link farm for phishing or malware distribution. The presence of PDF-specific heuristics and the nature of the URLs indicate a likely attempt to exploit users through malicious links, potentially leading to further exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • 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.
  • 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://pistant.ru/uplcv?utm_term=anodic+coating+protects+the+underlying+metal PDF link annotation
    • http://allprintusa.com/admin/images/file/48720260309.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/75242655089.pdfIn PDF document text
    • https://koratspring.com/upload/file/topesaguxupew.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/ee18a20ab22fbddf43adeeb31595a701/zowexok.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/cvsjpklh3fd47urv92dc8n5lcj/80915329992.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/40c1117222a0cc5b7b641d7fff28cfe9/5766183836.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1915ade56---wavuvuzikefadojadusujabus.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/76e34abf0cf2a54a4aaf3d5aa7ea546a/daloxomawijepukikuzeko.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/jbjjfa203n48fsul5nembjd5mk/kanalilopa.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a095388b945---gizafefiwukofowogutopa.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/dagewiresatifulubefareruw.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/77293239522.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00a1705eba---lujimema.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/99548853543.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/084e914389d6d958bdf81c19c6e3e08f/zemowosijivafilesaka.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/463bd824274c8eca1d40b07ae9e0bad3/rofip.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ntv72l4ggubrs4qad5poqm0fpq/febozopusewogelimevorat.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/149iem32bv5al6clpc9oorph05/98999071765.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160908b4849ac0---9815190468.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/5dfqa9d15t6mincam78csnev34/sefujoroli.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/73070037880.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e7124200c---78730440175.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/bagepegugolaxelowojod.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/34136004523.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/kunipemubo.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/7f723dadddcd8a294b4d0e8febbc1f86/vonosepisosefi.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/jukijidezeviwijutudin.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_off0000fed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EE 11156 bytes
SHA-256: 6af844d36317be096fccfd41d8391f722d2f5f63ec07d5fa213510f8d5a3936e
font_02_sfnt_off000130ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AB 17724 bytes
SHA-256: be7c3a27bae560fc06b68c888192b1716b607986157a17100b9958254ae6239d

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