Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6522a9dcb35a4b1…

MALICIOUS

PDF

68.0 KB Created: 2021-09-29 03:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 04356e41079f293e590c6b041807ecc8 SHA-1: 2a49cb59d80cebe5b705b72611eae99304b7d800 SHA-256: f6522a9dcb35a4b1b63f69998057efe092fd3d9f858ad7ddd7277abc94f39bc5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm heuristics, suggesting it is designed to redirect users to potentially harmful websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://philabc.ru/uplcv?utm_term=gane+sunane+wala+app PDF link annotation
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161511126b6eee---tujedetidaxetuwuguva.pdfIn PDF document text
    • http://rivucota.com/upload/files/niwibe.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/zenasakibeporomus.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/poxub.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c7c2abea1c---3554302149.pdfIn PDF document text
    • https://ksboutlet.com/file/files/24127546031.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147791ada194---pigolasakixukatom.pdfIn PDF document text
    • https://afayl.com/userfiles/file/17097602873.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/kibujej.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/50611373531.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/1abf12a11c8029da06ac5277c7d71842/galakebufogum.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/sibadema.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/minog.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/jilelomebezut.pdfIn PDF document text
    • https://badrivishal.com/media/letetezuvifudul.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/57928083933.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/87287491173.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210925_1B0B43BAD9F7450A.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/40704547844.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153aafc0fb30---2512588148.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/lujawod.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/manefeginepab.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_off0000aec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D5 14660 bytes
SHA-256: c5018bfc79372a551010efdfe1d3790e19e143f7ec337d9beb7e4aca000aef49
font_02_sfnt_off0000ec1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1C 10060 bytes
SHA-256: 5e476025d3a5c263a824b5caafa570fcd167fcdeed1a9be4fd8266bff351cb7c