Malicious PDF — malware analysis report

Static analysis result for SHA-256 077513a973856899…

MALICIOUS

PDF

81.2 KB Created: 2021-06-30 02:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1d7cf7b78eb70c03fde100e851c58b3e SHA-1: 8ac6bf0b743b234713aba570aef24b6608f6ce26 SHA-256: 077513a9738568992d75a369d3685547316c5fac32c9826d299f98566b600e90
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting it functions as a link farm to redirect users to malicious sites. The presence of these links and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/15abf4bf534642049d77c5729342bf40/tuwudejerekupeline.pdf In PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d8303e55e98---xagaluju.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/4a976c9670bb5ec3090edd26b4fdfb7d/tenivibeji.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/ripetom.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/fosunawurow.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcd35b7d88---99662957409.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160782f7367f0b---jugodezinigowawafomuwija.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d7abd9f53---lazujawolusaxokusan.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc64cdd150---10887881605.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///62059505219.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-6-23/20210623170518439120.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/44c96193efc1e0fa1695bfcc3263b967/1994534323.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/a2fd35d4fd09b0ec67a453b4ac38473a/8692374431.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/ba7017f436bb5c7c157d0226c50a7f79/peremitoroveledutez.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/49152085159.pdfIn PDF document text
    • https://alutat.com/data/file/serun.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/2467733919.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210611_A01B7AF8209410D5.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/76c21a5aeb555b9adc84c779a5ab2932/dafalumelakizexeligo.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/31846959966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=horry+county+inspectionsPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF341 16648 bytes
SHA-256: 7df9268cece17ae6d570e40a41ed094e24f0e504b892fab52db4fc554f03781d
font_02_sfnt_off00011ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED8 10364 bytes
SHA-256: aa2e37d94835a4257d8b2bacd616917596bd70e26c4bd55ada3740937cc5e434

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